The operations that make up an interface of a state machine may be of either the one-way or request-response type.

构成状态机接口的操作必须是请求-响应 类型。

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Is a class (or struct) that implements a more-derived interface also required to state in its base type list that it is implementing all of those less-derived interfaces?

一个实现了派生程度较高的接口的class或者struct必须要在其基类型列表中声明它实现了那些派生程度较低的接口吗？

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