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.
交互器：包含用例指定的业务逻辑。
Interactor: contains the business logic as specified by a use case.
因为功能点需要不断地处理包含用例的规格，所以还可以从中得到一些初步的数据。
Because function point counters frequently have to deal with specifications that contain use cases, some preliminary data is also available from them.
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