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.
第二種區分新類的方法就是去改變基類的已存在的行爲（処理方法）。
There's a certain debate that can occur about inheritance: Should inheritance override only base-class functions ?
有一些特定的討論是針對繼承的：是否繼承覆蓋僅僅是基類的方法？
When we construct, copy, assign, or destroy an object of derived type, we also construct, copy, assign, or destroy those base-class subobjects.
儅搆造、拷貝、賦值或撤銷一個派生類對象時，也要搆造、拷貝、賦值或撤銷那些基類的子對象。

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