Under Services, expand Service and select Iservice.
在 Services 下，展开 Service 并选择 Iservice。
Under Services, expand service and select the Iservice.
在Services下面，展开service并选择Iservice。
The IService interface may also have a changeItem() operation which, by definition, causes a change to the internal structure of an item.
IService 接口还能够具有一个 changeItem() 操作，按照其定义，此操作将导致对项目的内部结构的更改。
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