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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:Leader苦情励志大戏《养女》是一部以写实的手法，描述上世纪90年代至今，西安底层文化和真实生活的电视剧，也讲述了一个牵动着两代养女命运的家庭辛酸情感故事。通过刻画一群淳朴善良的西安市民形象，反映改革开放后西安的巨大变化，同时将西安风土人情尽情展现。Source: Brother Guo此剧讲述了认识20多年的青梅竹马在两个星期内同居并渐渐了解对方心意的音乐爱情故事。是一段“渐于爱情与友情”的心动罗曼史故事。范增欣然点头，西楚国众将全新点头应命，第一次这样众志成城……项羽嘴角露出一丝冷酷的笑容，刘邦你等着，到时候有让你哭的时候。