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"My parents often pick up a pile of junk from the outside."In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:这个视频算是意外之喜吧，不过既然侠客文化在背后做了，总会留下痕迹，就算没有这个视频，肯定也会有其他的东西。徐文长摊臂道，科举在前，天下精英皆位于朝中，我东番没得选，只有拉拢百姓，走民粹之路。这都拿的什么啊？吕馨啐了一口。在李家，所有的大事都是李敬文作主，还是不管事。