一个称为索引或注标的唯一号码，会与共用变数名称结合，用以分辨阵列中的每个元素。

A unique number, called an index or subscript, combined with the Shared variable name distinguishes each element in the array.

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如果您使用这个变数将参考传回类别的执行个体，则执行绪共用执行绪可以修改执行个体的成员，并当做传回值使用。

If you use this variable to pass a reference to an instance of a class, the members of the instance can be modified by the thread-pool thread and used as return values.

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多个执行绪可能需要存取共用资料库，或是对一组系统变数进行更新。

Multiple threads may need to access a Shared database, for instance, or make updates to a set of system variables.

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