For completeness the class diagram and sequence diagram are shown below.

作为补充，下面给出了类关系图和序列关系图。

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If the project organization is using UML for modeling, unit testers will need sequence diagrams, class diagrams, and perhaps activity diagrams.

如果这个项目组织利用uml来建模，那么单元测试将需要序列图，类图，可能还会需要活动图。

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As we move from use case diagrams into sequence and class diagrams, we will immediately notice the impact of known actors.

当我们从用例图转入到序列图和类图时，马上就会注意到已知的参与者的影响。

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