base class

基本解释

The second way to differentiate your new class is to change the behavior of an existing base-class function.
第二种区分新类的方法就是去改变基类的已存在的行为（处理方法）。
There's a certain debate that can occur about inheritance: Should inheritance override only base-class functions ?
有一些特定的讨论是针对继承的：是否继承覆盖仅仅是基类的方法？
When we construct, copy, assign, or destroy an object of derived type, we also construct, copy, assign, or destroy those base-class subobjects.
当构造、拷贝、赋值或撤销一个派生类对象时，也要构造、拷贝、赋值或撤销那些基类的子对象。

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