The mapping object is allocated in the constructor (set in italics).
映射对象由构造方法来分配（见其中的 斜体部分）。
If the positional argument is a mapping object, return a dictionary mapping the same keys to the same values as does the mapping object.
如果位置参数是一个映射对象，则返回像映射对象一样的键值映射。
The business object mapping editor can help by providing you with different views of the map.
业务对象映射编辑器可以帮助您，为您提供不同的映射视图。
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