At its basis lies the use case model, which consists of actors and use cases.
它的基础是用例模型，它由角色和用例组成。
However, at any given time, physics cannot explain the existence of its basis.
然而，在任何特定的时间，物理学无法解释自身基础的存在。
However, at any given time, physics cannot explain the existence of its basis.
然而，在任何特定的时间，物理学无法解释自身基础的存在。
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