您拥有一个索引。

You have an index.

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如果您拥有合适的技巧和权力，那么您可以更新或者展开这个类型的集合。

If you have the appropriate skills and authority, you can update or extend this set of types.

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您可能需要一个根本不执行任何工作的活动，例如，当您拥有一个需要某个活动的构造，但没有要执行的任何工作时。

You might need an activity that does nothing at all, such as when you have a construction that requires an activity, but there is no work to be done.

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