如我们早期注意到的，每个用例都有一组分别表示主要的和次要的事件流的情境。
As we noted earlier, every use case has a set of scenarios representing the main and alternate flows of events, respectively.
如我们早期注意到的，每个用例都有一组分别表示主要的和次要的事件流的情境。
As we noted earlier, every use case has a set of scenarios representing the main and alternate flows of events, respectively.
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