Update cube.sgml

——row28至37，增英和翻为：
<!--==========================orignal english content==========================
 <para>
  This module is considered <quote>trusted</quote>, that is, it can be
  installed by non-superusers who have <literal>CREATE</literal> privilege
  on the current database.
 </para>
____________________________________________________________________________-->
 <para>
  此模块被视为<quote>trusted</quote>，也就是说，它可以由在当前数据库上具有 <literal>CREATE</literal> 权限的非超级用户安装。
 </para>

——row223至230，调英和翻为：
  <para>
   <xref linkend="cube-operators-table"/> shows the specialized operators
   provided for type <type>cube</type>.
  </para>
____________________________________________________________________________-->
  <para>
   <xref linkend="cube-operators-table"/>展示了为类型<type>cube</type>提供的专用的操作符。
  </para>

——row232至440，调英和翻为：
  <table id="cube-operators-table">
<!--==========================orignal english content==========================
   <title>Cube Operators</title>
____________________________________________________________________________-->
   <title>立方体操作符</title>
    <tgroup cols="1">
     <thead>
<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        Operator
       </para>
       <para>
        Description
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        操作符
       </para>
       <para>
        描述
       </para></entry>
      </row>
     </thead>

     <tbody>
<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&amp;&amp;</literal> <type>cube</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        Do the cubes overlap?
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&amp;&amp;</literal> <type>cube</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        立方体是否有重叠?
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>@&gt;</literal> <type>cube</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        Does the first cube contain the second?
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>@&gt;</literal> <type>cube</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        第一个立方体是否包含第二个立方体?
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&lt;@</literal> <type>cube</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        Is the first cube contained in the second?
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&lt;@</literal> <type>cube</type>
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        第一个立方体是否包含在第二个立方体里面?
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>-&gt;</literal> <type>integer</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        Extracts the <parameter>n</parameter>-th coordinate of the cube
        (counting from 1).
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>-&gt;</literal> <type>integer</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        提取立方体的第 <parameter>n</parameter>个坐标，(从1开始计数)。
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>~&gt;</literal> <type>integer</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        Extracts the <parameter>n</parameter>-th coordinate of the cube,
        counting in the following way: <parameter>n</parameter> = 2
        * <parameter>k</parameter> - 1 means lower bound
        of <parameter>k</parameter>-th dimension, <parameter>n</parameter> = 2
        * <parameter>k</parameter> means upper bound of
        <parameter>k</parameter>-th dimension.  Negative
        <parameter>n</parameter> denotes the inverse value of the corresponding
        positive coordinate.  This operator is designed for KNN-GiST support.
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>~&gt;</literal> <type>integer</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        提取立方体的第 <parameter>n</parameter>个坐标,以下列方式计数:
        <parameter>n</parameter> = 2 * <parameter>k</parameter> - 1 表示第<parameter>k</parameter>个维度的下限，
        <parameter>n</parameter> = 2 * <parameter>k</parameter> 表示第<parameter>k</parameter>个维度的上限。
        负的<parameter>n</parameter>表示相应正坐标的倒数值。此操作符专为 KNN-GiST 支持而设计。
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&lt;-&gt;</literal> <type>cube</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        Computes the Euclidean distance between the two cubes.
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&lt;-&gt;</literal> <type>cube</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        计算两个立方体之间的欧几里德距离.
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&lt;#&gt;</literal> <type>cube</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        Computes the taxicab (L-1 metric) distance between the two cubes.
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&lt;#&gt;</literal> <type>cube</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        计算两个立方体之间的直线（L-1 度量）距离。
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&lt;=&gt;</literal> <type>cube</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        Computes the Chebyshev (L-inf metric) distance between the two cubes.
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <type>cube</type> <literal>&lt;=&gt;</literal> <type>cube</type>
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        计算两个立方体之间的切比雪夫（L-inf 度量）距离.
       </para></entry>
      </row>
     </tbody>
   </tgroup>
  </table>

——row456至472，调英和翻为：
  <para>
   In addition to the above operators, the usual comparison
   operators shown in <xref linkend="functions-comparison-op-table"/> are
   available for type <type>cube</type>.  These
   operators first compare the first coordinates, and if those are equal,
   compare the second coordinates, etc.  They exist mainly to support the
   b-tree index operator class for <type>cube</type>, which can be useful for
   example if you would like a UNIQUE constraint on a <type>cube</type> column.
   Otherwise, this ordering is not of much practical use.
  </para>
____________________________________________________________________________-->
  <para>
   除上述操作符外，<xref linkend="functions-comparison-op-table"/> 中显示的常用比较操作符也可用于<type>cube</type>类型。
   这些操作符首先比较第一个坐标，如果它们相等再比较第二个坐标等等。
   它们主要为支持<type>cube</type>的 b树索引操作符类而存在，这类操作符对支持<type>cube</type>列上的 UNIQUE 约束等很有用。
   否则，这种排序没有太大的实际作用。
  </para>

——row543至1052，调英和翻为：
  <table id="cube-functions-table">
<!--==========================orignal english content==========================
   <title>Cube Functions</title>
____________________________________________________________________________-->
   <title>立方体函数</title>
    <tgroup cols="1">
     <thead>
<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        Function
       </para>
       <para>
        Description
       </para>
       <para>
        Example(s)
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        函数
       </para>
       <para>
        描述
       </para>
       <para>
        示例
       </para></entry>
      </row>
     </thead>

     <tbody>
<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>float8</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Makes a one dimensional cube with both coordinates the same.
       </para>
       <para>
        <literal>cube(1)</literal>
        <returnvalue>(1)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>float8</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        制作一个一维立方体，其两个坐标都是相同的。
       </para>
       <para>
        <literal>cube(1)</literal>
        <returnvalue>(1)</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>float8</type>, <type>float8</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Makes a one dimensional cube.
       </para>
       <para>
        <literal>cube(1,2)</literal>
        <returnvalue>(1),(2)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>float8</type>, <type>float8</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        制作一个一维立方体。
       </para>
       <para>
        <literal>cube(1,2)</literal>
        <returnvalue>(1),(2)</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>float8[]</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Makes a zero-volume cube using the coordinates defined by the array.
       </para>
       <para>
        <literal>cube(ARRAY[1,2,3])</literal>
        <returnvalue>(1, 2, 3)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>float8[]</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        使用数组定义的坐标制作一个零值的立方体
       </para>
       <para>
        <literal>cube(ARRAY[1,2,3])</literal>
        <returnvalue>(1, 2, 3)</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>float8[]</type>, <type>float8[]</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Makes a cube with upper right and lower left coordinates as defined by
        the two arrays, which must be of the same length.
       </para>
       <para>
        <literal>cube(ARRAY[1,2], ARRAY[3,4])</literal>
        <returnvalue>(1, 2),(3, 4)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>float8[]</type>, <type>float8[]</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        用由两个数组定义的右上和左下坐标制造一个立方体，两个数组必须等长。
       </para>
       <para>
        <literal>cube(ARRAY[1,2], ARRAY[3,4])</literal>
        <returnvalue>(1, 2),(3, 4)</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>cube</type>, <type>float8</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Makes a new cube by adding a dimension on to an existing cube,
        with the same values for both endpoints of the new coordinate.  This
        is useful for building cubes piece by piece from calculated values.
       </para>
       <para>
        <literal>cube('(1,2),(3,4)'::cube, 5)</literal>
        <returnvalue>(1, 2, 5),(3, 4, 5)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>cube</type>, <type>float8</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        在一个现有的立方体上增加一维来制造一个新立方体，对新坐标的各个端点都采用相同的值。这可以用于从计算得到的值逐渐地构建立方体。
       </para>
       <para>
        <literal>cube('(1,2),(3,4)'::cube, 5)</literal>
        <returnvalue>(1, 2, 5),(3, 4, 5)</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>cube</type>, <type>float8</type>, <type>float8</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Makes a new cube by adding a dimension on to an existing cube. This is
        useful for building cubes piece by piece from calculated values.
       </para>
       <para>
        <literal>cube('(1,2),(3,4)'::cube, 5, 6)</literal>
        <returnvalue>(1, 2, 5),(3, 4, 6)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube</function> ( <type>cube</type>, <type>float8</type>, <type>float8</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        在一个现有的立方体上增加一维来制造一个新立方体。这可以用于从计算得到的值逐渐地构建立方体。
       </para>
       <para>
        <literal>cube('(1,2),(3,4)'::cube, 5, 6)</literal>
        <returnvalue>(1, 2, 5),(3, 4, 6)</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_dim</function> ( <type>cube</type> )
        <returnvalue>integer</returnvalue>
       </para>
       <para>
        Returns the number of dimensions of the cube.
       </para>
       <para>
        <literal>cube_dim('(1,2),(3,4)')</literal>
        <returnvalue>2</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_dim</function> ( <type>cube</type> )
        <returnvalue>integer</returnvalue>
       </para>
       <para>
        返回该立方体的维数。
       </para>
       <para>
        <literal>cube_dim('(1,2),(3,4)')</literal>
        <returnvalue>2</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_ll_coord</function> ( <type>cube</type>, <type>integer</type> )
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        Returns the <parameter>n</parameter>-th coordinate value for the lower
        left corner of the cube.
       </para>
       <para>
        <literal>cube_ll_coord('(1,2),(3,4)', 2)</literal>
        <returnvalue>2</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_ll_coord</function> ( <type>cube</type>, <type>integer</type> )
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        返回一个立方体的左下角的第 <parameter>n</parameter>个坐标值
       </para>
       <para>
        <literal>cube_ll_coord('(1,2),(3,4)', 2)</literal>
        <returnvalue>2</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_ur_coord</function> ( <type>cube</type>, <type>integer</type> )
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        Returns the <parameter>n</parameter>-th coordinate value for the
        upper right corner of the cube.
       </para>
       <para>
        <literal>cube_ur_coord('(1,2),(3,4)', 2)</literal>
        <returnvalue>4</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_ur_coord</function> ( <type>cube</type>, <type>integer</type> )
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        返回一个立方体的右上角的第<parameter>n</parameter>个坐标值
       </para>
       <para>
        <literal>cube_ur_coord('(1,2),(3,4)', 2)</literal>
        <returnvalue>4</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_is_point</function> ( <type>cube</type> )
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        Returns true if the cube is a point, that is,
        the two defining corners are the same.
       </para>
       <para>
        <literal>cube_is_point(cube(1,1))</literal>
        <returnvalue>t</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_is_point</function> ( <type>cube</type> )
        <returnvalue>boolean</returnvalue>
       </para>
       <para>
        如果一个立方体是一个点则返回真，也就是两个定义点相同。
       </para>
       <para>
        <literal>cube_is_point(cube(1,1))</literal>
        <returnvalue>t</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_distance</function> ( <type>cube</type>, <type>cube</type> )
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        Returns the distance between two cubes. If both
        cubes are points, this is the normal distance function.
       </para>
       <para>
        <literal>cube_distance('(1,2)', '(3,4)')</literal>
        <returnvalue>2.8284271247461903</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_distance</function> ( <type>cube</type>, <type>cube</type> )
        <returnvalue>float8</returnvalue>
       </para>
       <para>
        返回两个立方体之间的距离。如果两个都是点，这就是普通距离函数。
       </para>
       <para>
        <literal>cube_distance('(1,2)', '(3,4)')</literal>
        <returnvalue>2.8284271247461903</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_subset</function> ( <type>cube</type>, <type>integer[]</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Makes a new cube from an existing cube, using a list of
        dimension indexes from an array. Can be used to extract the endpoints
        of a single dimension, or to drop dimensions, or to reorder them as
        desired.
       </para>
       <para>
        <literal>cube_subset(cube('(1,3,5),(6,7,8)'), ARRAY[2])</literal>
        <returnvalue>(3),(7)</returnvalue>
       </para>
       <para>
        <literal>cube_subset(cube('(1,3,5),(6,7,8)'), ARRAY[3,2,1,1])</literal>
        <returnvalue>(5, 3, 1, 1),(8, 7, 6, 6)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_subset</function> ( <type>cube</type>, <type>integer[]</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        从一个现有的立方体制造一个新立方体，使用来自于一个数组的维索引列表。
        它可以被用来抽取一个单一维度的端点，或者它可以被用来去除维度，或者按照需要对它们重新排序。
       </para>
       <para>
        <literal>cube_subset(cube('(1,3,5),(6,7,8)'), ARRAY[2])</literal>
        <returnvalue>(3),(7)</returnvalue>
       </para>
       <para>
        <literal>cube_subset(cube('(1,3,5),(6,7,8)'), ARRAY[3,2,1,1])</literal>
        <returnvalue>(5, 3, 1, 1),(8, 7, 6, 6)</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_union</function> ( <type>cube</type>, <type>cube</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Produces the union of two cubes.
       </para>
       <para>
        <literal>cube_union('(1,2)', '(3,4)')</literal>
        <returnvalue>(1, 2),(3, 4)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_union</function> ( <type>cube</type>, <type>cube</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        产生两个立方体的并集。
       </para>
       <para>
        <literal>cube_union('(1,2)', '(3,4)')</literal>
        <returnvalue>(1, 2),(3, 4)</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_inter</function> ( <type>cube</type>, <type>cube</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Produces the intersection of two cubes.
       </para>
       <para>
        <literal>cube_inter('(1,2)', '(3,4)')</literal>
        <returnvalue>(3, 4),(1, 2)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_inter</function> ( <type>cube</type>, <type>cube</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        产生两个立方体的交集。
       </para>
       <para>
        <literal>cube_inter('(1,2)', '(3,4)')</literal>
        <returnvalue>(3, 4),(1, 2)</returnvalue>
       </para></entry>
      </row>

<!--==========================orignal english content==========================
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_enlarge</function> ( <parameter>c</parameter> <type>cube</type>, <parameter>r</parameter> <type>double</type>, <parameter>n</parameter> <type>integer</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        Increases the size of the cube by the specified
        radius <parameter>r</parameter> in at least <parameter>n</parameter>
        dimensions.  If the radius is negative the cube is shrunk instead.
        All defined dimensions are changed by the
        radius <parameter>r</parameter>.  Lower-left coordinates are decreased
        by <parameter>r</parameter> and upper-right coordinates are increased
        by <parameter>r</parameter>.  If a lower-left coordinate is increased
        to more than the corresponding upper-right coordinate (this can only
        happen when <parameter>r</parameter> &lt; 0) than both coordinates are
        set to their average.  If <parameter>n</parameter> is greater than the
        number of defined dimensions and the cube is being enlarged
        (<parameter>r</parameter> &gt; 0), then extra dimensions are added to
        make <parameter>n</parameter> altogether; 0 is used as the initial
        value for the extra coordinates.  This function is useful for creating
        bounding boxes around a point for searching for nearby points.
       </para>
       <para>
        <literal>cube_enlarge('(1,2),(3,4)', 0.5, 3)</literal>
        <returnvalue>(0.5, 1.5, -0.5),(3.5, 4.5, 0.5)</returnvalue>
       </para></entry>
      </row>
____________________________________________________________________________-->
      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <function>cube_enlarge</function> ( <parameter>c</parameter> <type>cube</type>, <parameter>r</parameter> <type>double</type>, <parameter>n</parameter> <type>integer</type> )
        <returnvalue>cube</returnvalue>
       </para>
       <para>
        用一个指定的半径<parameter>r</parameter>在至少<parameter>n</parameter>个维度上增加立方体的尺寸。
        如果该半径是负值，则该立方体会收缩。所有已定义的维度都会按照半径<parameter>r</parameter>被改变。
        左下坐标按照 <parameter>r</parameter>被减小并且右上坐标按照 <parameter>r</parameter>被增加。
        如果一个左下坐标被增加得超过对应的右上坐标（这只会发生在<parameter>r</parameter> &lt; 0 时），则两个坐标会被设置为它们的均值。
        如果<parameter>n</parameter>大于已定义的维度数并且该立方体被增加（<parameter>r</parameter> &gt; 0）， 则额外的维度会被加入以让维度数达到<parameter>n</parameter>，对于额外的坐标将使用 0 作为初始值。
        这个函数可用来创建围绕一个点的边界框以搜索临近点。
       </para>
       <para>
        <literal>cube_enlarge('(1,2),(3,4)', 0.5, 3)</literal>
        <returnvalue>(0.5, 1.5, -0.5),(3.5, 4.5, 0.5)</returnvalue>
       </para></entry>
      </row>
     </tbody>
    </tgroup>
  </table>

——row1209至1225，调英和翻为：
  <para>
   My thanks are primarily to Prof. Joe Hellerstein
   (<ulink url="https://dsf.berkeley.edu/jmh/"></ulink>) for elucidating the
   gist of the GiST (<ulink url="http://gist.cs.berkeley.edu/"></ulink>), and
   to his former student Andy Dong for his example written for Illustra.
   I am also grateful to all Postgres developers, present and past, for
   enabling myself to create my own world and live undisturbed in it. And I
   would like to acknowledge my gratitude to Argonne Lab and to the
   U.S. Department of Energy for the years of faithful support of my database
   research.
  </para>
____________________________________________________________________________-->
  <para>
   我的感谢主要要献给 Joe Hellerstein 教授(<ulink url="https://dsf.berkeley.edu/jmh/"></ulink>)，他阐明了 GiST （<ulink url="http://gist.cs.berkeley.edu/"></ulink>），还要送给他以前的学生 Andy Dong，他为 Illustra 编写了例子。
   我也对所有的 Postgres 开发者（现在的和以前的）心存感激，他们让我能够创造自己的世界并且宁静地生活在其中。
   我也要感谢阿尔贡实验室和美国能源局对我多年数据库研究的支持。
  </para>

Author: chegong18