When you design an object-oriented framework, you have essentially two abstraction tools available: methods and classes.
当设计一个面向对象的框架时，实际上可以使用两种抽象工具：方法和类。
When you design an object-oriented framework, you have essentially two abstraction tools available: methods and classes.
当设计一个面向对象的框架时，实际上可以使用两种抽象工具：方法和类。
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