可利用介面的参考来公开呼叫这些成员。
These members are publicly callable by using a reference to the interface.
相同的包装函式会完全公开五个介面。
可连接物件(即来源)可以公开本身的介面或任何输出介面的连接点。
A connectable object (that is, a source) can expose a connection point for its own interfaces or for any outgoing interface.
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