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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:However, many enterprises have already found the clue when they are attacked for the first time, and security managers also need to give an answer as to whether malicious attacks will come back. Therefore, although CSO people do not want to talk much, we still hope to know their handling attitude. In order to avoid unexpected troubles, we reported the experiences of several CSO's in the work in an anonymous form, and discussed why the security strategy that had always worked failed in the end.川本筑美是一个不善于交际，也没有朋友的女人。　　当她在Instagram上看到昵称为“白马”的账号时，她被照片记录的诱人美食所吸引。　　这些图文引起了她的共鸣。　　筑美开始自己吃饭，吃的食物和“白马”一样。　　另一方面，“白马”的帖子获得的唯一的“赞”就是筑美的“赞”；管理“白马”账号的白石和间对此感到高兴，并殷切期待着筑美的“赞”。DDoS attacks can be divided into many different forms. These forms include flood attacks and more sophisticated application layer attack methods/tools. Flood attacks rely on a large amount of traffic/sessions to deplete a target, such as TCP SYN, ICMP, and UDP floods; Advanced application layer attack methods/tools include Slowloris, KillApache, etc.Source: China Court Network: Criminal Law转头无意中扫过粪坑，却见里面好些黑色的草木灰，正是黎水刚才倒便溺的地方。