根据位置或唯一标识符返回集合中的特定成员。
Returns a specific member of the collection according to its position or a unique identifier.
指示字（符）是提示某个数据项位置的一种标识符。
Pointer is an identifier that indicates the location of an item of data .
指示字（符）是提示某个数据项位置的一种标识符。
Pointer is an identifier that indicates the location of an item of data .
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