领域模型展示了主要商业实体，它们的功能责任，以及实体之间的关系。
The domain model typically shows the major business entities, their functional responsibilities, and the relationships among the entities.
在测试4中，我们想要确定，如果名称随机化功能成为测试机的责任，那么不运行应用程序的CPU时间是多少。
In test 4, we wanted to determine how much CPU time is freed from the application server if the name randomization functionality becomes the test machine's responsibility.
在有些情况下，单个工具可能会提供满足给定责任集的所有功能，甚至能够满足多个角色的需求。
In some cases, a single tool may provide all the functionality to meet the needs of a given set of responsibilities and may even meet the needs of multiple roles.
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