一个对象，用于提供对父对象的基类列表的访问。
An object providing access to the base class list of the parent object.
不能将非专用化的类模板用作基类列表中的模板参数。
An unspecialized class template cannot be used as a template argument in a base class list.
应删除接口成员的实现，或将接口添加到类的基类列表中。
You should either delete the implementation of the interface member or add the interface to the base-class list of the class.
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