那么就是说派生程度较低的接口是否被声明在基类列表中是可选的了?
So it's optional whether the less-derived implemented interfaces are stated in the base type list?
当在派生类中重写时,使用指定的绑定约束并匹配指定的参数列表、修饰符和区域性,调用指定成员。
When overridden in a derived class, invokes the specified member, using the specified binding constraints and matching the specified argument list, modifiers and culture.
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