Another reason is that by passing a DictionaryIO object to Dictionary, you can take advantage of classswitching, 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。
2
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。
3
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.