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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:Finally, a Light.prototype.setState method is provided, through which the state object can switch the state of the light object. The switching rules of states are well defined in each state class in advance. No more conditional branch statements related to state switching can be found in Context:围观众人都看呆了，场中一片寂静。219. X.X.1Zhejiang Province　　在新一季，Blanca Suárez、Ana Fernández、Nadia de Santiago和Ana Polvorosa所扮演的角色将在一个以提高妇女权利和自由为标志的时期经历日常生活中的改变。The wines of Chateau La Tour Carnet are medium to heavy-bodied, with strong tannins, rich and sweet fruit aroma and jam-like taste. The quality of the wine produced every year is relatively stable, and because the manor is not well known, the price will not be too high, and it will often be worth it. In recent years, Carrie Fort has performed quite well. In some good years, it has successively achieved remarkable results in international competitions.