换句话说，如果SAD中的指示，连同实际的用例规格说明对开发人员来说足够构建用例的代码，那么用例实现就是空的。
In other words, if the directions in the SAD together with the actual Use-Case Specification are sufficient for the developer to build the code of the use case, the Use-Case Realization is empty.
话说到此，最安全的结论应该是说，如果要解释为何人人听音乐，难道有比用音乐来消磨时间的理由更切实际呢？
It is therefore safe to conclude that what other reason can be more practical to listen to music than saying that music is the best means people can have of digesting time?
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