Use case diagram Provides a behavioral view of system context by displaying actors external to the system who go to the system to achieve a specific, valued result (use case).
用例图通过向即将使用系统的人员提供一个系统背景的行为性视图，来取得一个特定有价值的结果(用例)。
Figure 2: UML sequence diagram showing behavioral elements.
图2：uml是序列图显示了行为元素。
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