按用例分组(实例：实现已知用例的类分为一组)。
Grouping by use case (example: the classes that implement a given use case are grouped).
用例既不是类规范，也不是数据规范。
A use case is neither a class specification nor a data specification.
这些是包含用例扩展功能集合的类。
These are the classes that contain the extended set of functions for the use case.
用例集合的公共类集合仅仅简单地定义为。
The set of common classes for the set of use cases is simply defined as.
用例分析第三步：为用例行为找出分析类。
Use-case analysis step 3: Find analysis classes from use-case behavior.
用例分析第四步：描述类的职责。
Use-Case Analysis step 4: Describe the class's responsibilities.
用例分析第四步：描述类的职责。
Use-Case Analysis step 4: Describe the class's responsibilities.
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