如果正常类包含抽象方法，则可以创建该类的对象，可以调用抽象方法就像普通的方法。

If the normal class contains abstract method, then one can creating the object for that class and may call the abstract method just like normal method.

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我们以特定的方式编写代码，以调用抽象方法，使某个基础隐藏逻辑负责将请求调度到恰当的实现，如下所示。

We write our code in such a way that we invoke some abstract method, and some underlying, hidden logic is responsible for dispatching the request to an appropriate implementation, as follows.

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所有的服务实现支持同一个抽象接口，这样客户机就可以用完全相同的方法来调用它们中的每一个。

All of the service implementations support the same abstract interface, so that clients can invoke each of them in the exact same way.

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