显示服务器——此模式将表示实现定义为显示信息和订阅事件的抽象服务。

Display server — This pattern defines the presentation implementation as an abstract service for displaying information and subscribing to events.

youdao

这会允许你扩展抽象事物，定义一个新的实现(如apache服务器)而不需要修改任何客户端代码。

This would allow you to extend the abstract thing and define a new implementation (say, ApacheServer) without doing any change in the client code.

youdao