derived class

基本解释

A derived-class member with the same name as a member of the base class hides direct access to the base-class member.
当派生类的成员和基类成员名字相同时，派生类的成员屏蔽了对基类此成员的直接访问。
This constructor is called by derived-class constructors to initialize the base class and is not intended for use directly from your code.
此构造函数由派生类构造函数调用以初始化基类，不适合直接在代码中使用。
If the base member took different arguments than the derived-class member, there would be no way to call the derived function from a reference or pointer to the base type.
如果基类成员与派生类成员接受的实参不同，就没有办法通过基类类型的引用或指针调用派生类函数。

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