因此，用例是关于以下内容的文本描述：希望系统如何工作、将涉及到哪些人以及他们之间如何交互、系统在正常运行时如何工作，以及出现错误时应该如何处理。

So a use case is a text description of how you want the system to work, who's involved and how they interact, how it all works when things go right, and what should happen when things go wrong.

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