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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:Source of reference:A dozen means 12, and a dozen socks means 12 pairs.//and B methods; Method A and method B write specific business logic in subclasses in turn.将来我要是把这事告诉葫芦哥哥，他一准不相信。该剧改编自横山もよ的同名漫画，讲述了jijikb.Com不相信男人的主人公小林春，与不能作为男朋友的“3B”——乐队男·美容师·调酒师3个男人编织的恋爱故事。DDoS attacks have been unprecedented in the past few years. Hacker activists know that the downtime of financial service websites means millions of dollars in business losses every minute. The attacks on Bank of America, First Capital Finance Corporation, Chase Bank, Citibank, PNC Bank and Wells Fargo Bank are ruthless and subtle, making many security executives even too afraid to discuss the details in depth.