活动图（如文中第 2 所描述的）执行时使用测试环境的功能。
The Activity diagram (described in Part 2 of the article) uses the functions of the test context for its execution.
图5显示了描述用例的活动图。
Figure 5 displays an activity diagram describing this use case.
通过活动图可以清楚的描述类的行为。
The behavior of the class is described using an activity graph.
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