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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:很快，那几栋小木屋已经映入视野。Unexpectedly, the ship did not sink, because there was nothing in the warehouse and there was not much water in the water warehouse. It was just that the engine room was flooded and could not sink or move. It had to wait for rescue. When asking for help, Liu Guiduo said that there were 15 people, but now there were only 11. Liu Guiduo suggested pushing the killing on the four people who ran away and leaving us clean.好了好了，刚才是我对不起了。ExclusionWhat is the event distribution mechanism?