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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:From this point, we can draw a conclusion: the Vietnamese army has not only planned for a long time to use "living biological weapons", but also conducted a lot of research and drills, even live ammunition tests, before using them. According to the obtained data, it has formulated corresponding usage methods and tactics, and may even form relevant written regulations and regulations.Master Control End: The master control end is some hosts illegally invaded and controlled by attackers. These hosts also control a large number of proxy hosts respectively. Specific programs are installed on the master host, so they can accept special instructions from attackers and send these commands to the proxy host.Advanced system variables; Environmental variables;《谁是爸爸》：讲述了四个医生因为一个基因突变的新生儿而引发了一系列的情感纠葛，最终有情人终成眷属的故事。全剧围绕“谁是爸爸”这个主题，引出了夫妻之间、恋人之间、母女之间等多条感情线，生活中的情感悬疑，情与义、爱与恨、名与利在剧中表现得淋漓尽致，环环相扣的情节更是牵动人心。本剧由台湾著名导演孙树培执导，张国强、周蜜和崔鹏等人主演，并有刘雪华、寇振海、李颖和温海波等老戏骨倾力加盟。　　事实上，Milin心里深藏的秘密，是早已爱上自己的对手Anawin，她的爱情能成真吗？即便她知道Anawin的心里有后妈的影子，最重要的是，两家的深深敌意...……下午，周夫子从宫中出来，便带着周菡周篁回到周家老宅。