When you are use-case modeling, your goal is to use actors to model roles and not the physical, real-world people, organizations, or systems themselves.
当进行用例建模时，您的目的是使用参与者来对角色建模，而不是对物理的、现实世界的人、组织或系统本身。
Then physicists can refine the model bit by bit, according to how given physical systems are known to behave.
看，这是物理学中的一种标准方式——首先通过一些计算来近似地得到粗略的结果，然后物理学家再根据给出的物理系统的行为方式来逐步完善这个模型。
The present model involves only three parameters with clear physical significance. Thereforeit can be easily applied to some complicated systems, such as semiconductor superlattices.
由于本文的模型只引入了三个参数，具有参数少，物理图象清晰的性质，因此，这个模型可以应用到复杂的体系，如超晶格等。
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