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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:这一聊，就到了三更天。超甜的～又短又无脑～看的真轻松～ 女主肯定会大势。。男主不笑的颜值拯救了笑起来的尬演 很可爱很春天。青梅竹马后来分开又再同居的小男友帮女主实现全部小清新梦想啊……前世人人都知道她是南城恶女，却不知道其实只是莽撞无脑的女配，在被设计陷害、名誉尽毁、暴毙街头后，她重生而来——这一世，绝不会让那群真正的恶人好过！5. Usually, the edge of the sole of weightlifting shoes will exceed the upper, i.e. The sole is relatively wide, further increasing the stability, but due to the requirements of the competition rules, it cannot exceed too much.然而打了几场胜仗之后，章邯便堂而皇之地成了上将军，王离的羡慕逐渐转化成了嫉妒。Rule: Try to match each message flowing through here according to the specified matching conditions. Once the matching is successful, the processing action specified after the rule will process it.