update pivot.rst

Author: renmu123

pivot.rst

@@ -1,19 +1,16 @@
-Pivot Tables
+数据透视表
 ============
 
-openpyxl provides read-support for pivot tables so that they will be
-preserved in existing files. The specification for pivot tables, while
+openpyxl 为数据透视表提供读取支持以便于可以保留在现有的文件中。
+数据透视表的规范虽然很广泛，但不是很清楚，也不意味着客户端代码应该能够创建数据透视表。（The specification for pivot tables, while
 extensive, is not very clear and it is not intended that client code should
-be able to create pivot tables. However, it should be possible to edit and
-manipulate existing pivot tables, eg. change their ranges or whether they
-should update automatically settings.
+be able to create pivot tables.）
+但是，应该可以编辑和操作现有的数据透视表，例如。更改其范围或是能自动更新设置。
 
-As is the case for charts, images and tables there is currently no management
-API for pivot tables so that client code will have to loop over the
-``_pivots`` list of a worksheet.
+和图表、图片、表格一样，数据透视表没有专门管理的 API，因此客户端代码不得不遍历工作表 ``_pivots`` 列表
 
 
-Example
+例子
 -------
 
 .. code::
@@ -25,4 +22,4 @@ Example
     pivot.cache.refreshOnLoad = True
 
 
-For further information see :class:`openpyxl.pivot.cache.CacheDefinition`
+更多信息 请查询 :class:`openpyxl.pivot.cache.CacheDefinition`