Another reason is that by passing a DictionaryIO object to Dictionary, you can take advantage of class switching, or polymorphism.

另一个原因是通过将DictionaryIO对象传递给Dictionary，可以利用类切换或多态性。

youdao

Switching an implementation class now becomes a matter of simply modifying the Spring configuration file.

切换实现类现在成了一件非常简单的事情，只需修改 Spring 配置文件即可。

youdao

As an important class of hybrid dynamical systems, a switched system is composed of several continuous time subsystems or discrete time subsystems and the switching signal among them.

切换动态系统是一类重要的混合动态系统，它是由几个连续时间子系统或离散时间子系统及作用在其中的切换规则构成的。

youdao

It stands to benefit from a rising middle class that is switching from the harsh, hand-rolled cigarettes sold individually by street vendors.

FORBES: Bad government, good companies