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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:6 "Flash" refers to a signal lamp that flashes 120 times or more per minute at regular intervals.迪士尼频道宣布《长发公主：剧集版》第三季已获续订。塔里克试图恢复正常的大学生活；布雷登为塔里克提供了一个逃跑的机会；莫奈为企业制定计划以保护她的孩子；凯恩找到了一个新的家庭，为自己走上街头。　　然而，天有不测风云，一场又一场的麻烦和变故，接二连三地降落在他们身上……听着外面渐渐静了，玉米便一挥手道：走。　　直到有一天，他被骤然爆发的血雨腥风抛向了命运的惊涛骇浪，欲逃无路，欲罢不能。从此，十分惜命的草根贱民板凳与命悬一线的中共党员唐雪梅及其“女儿”小女孩红儿，结下了不解之缘，彼此间发生了一连串的恩恩怨怨、分分合合，以及心灵的碰撞、情感的纠葛。而令板凳命运突变和陡转的那一天便是1927年4月12日。