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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:10. In the multi-player team formation mode, when a teammate survives, the player will enter a near-death state after being defeated, and other surviving teammates can approach and rescue him.小七加入了由曾经的国家搜救队队员安心（宋妍霏饰）组建的民间狗狗搜救队，和电竞高手边慕（姜潮饰）意外成为搭档，在一起训练的过程中渐渐化敌为友，克服了恐高等弱点，通过了考核，成为一名训练有素的专业搜救犬。小七和狗狗搜救队的队友们遇到失踪老人、雪崩被困驴友、火灾被困少年等搜救任务，它们机智勇敢，团结一心，和各自的训犬员完美配合。退役军犬“步枪”在协助公安抓捕犯罪嫌疑人时为救小七而牺牲，小七成为狗狗搜救队新首领，但它在执行搜救任务时嗅觉遭到重创，幸得儿子“小小七”出现，以及队员们的悉心照料，小七恢复嗅觉后与儿子小小七一起“上阵父子兵”，完美完成搜救任务，成为狗狗搜救队真正的领袖。地震灾后现场，搜救队在小七的带领下英勇冲锋，拯救生命。小七和它的伙伴们默默为人类的幸福努力，治愈了每个人的内心。此剧讲述三个女人因错误的欲望和贪欲酿成悲剧，她们在疯狂斗争中寻找人生答案的故事。It is emphasized here that the request on the link can be a chain, a tree or a ring. The pattern itself does not restrict this and needs to be implemented by ourselves. At the same time, at a time, commands are only allowed to be passed from one object to another, not to multiple objects.Khaki: Guava, wormwood, mango, water chestnut, etc少年不悦地问道：王管家，你想干什么？王管家笑道：少爷，属下别无他意，只想问这虎王寨的寨主几个问题，以释心中疑惑。