1、Linker error from not declaring abstract method in abstract base class?
鏈接錯誤不能聲明抽象方法的抽象基類？

2、Because having an abstract method makes it an abstract class. The reasoning is circular.
因為有一個抽象方法使得一個抽象類。推理是圓形的。

3、Any class that declares an abstract method must itself be declared abstract.
聲明抽象方法的任何類本身必須是聲明為抽象的。

4、Comparing study of Abstract Method and Citation Method
文摘法與引證法的比較研究

5、The abstract method processResponse will be implemented by the sub-classes.
抽象方法processresponse由子類實現。

abstract method翻譯