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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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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