系统用例生命周期 system use case life cycle
子系统用例生命周期 subsystem use case life cycle
工件组织用例生命周期 organization use case life cycle
在这些接口当中，对于本文样例最重要的接口就是生命周期接口。
Of these interfaces, the most important one for this particular sample is the lifecycle interface.
用例3——为应用和过程逻辑优化生命周期。
Use Case 3 - Optimizing the lifecycle for application and process logic.
场景，档案，用例：贯穿系统开发生命周期。
Scenarios, stories, use cases: Through the systems development life-cycle.
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