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A first-class pilot needs more than 1,000 hours of safe flight time.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:英布道：之前项羽多次攻打荥阳和成皋，都是两座城池相互依靠，相互支持，打退楚军的。4, What a coincidence, I am 173CM tall, so is the goddess. So you see, although the goddess is very tall, she is actually similar to me!　　当太子无鸾出现在婉后面前，婉后抱住少年时的情人，仿若生死两别。但是无鸾一声：“母后”将她残酷的推开。她不再是无鸾少年时习武的陪伴者，她不再是无鸾的后母，此时，她将成为新的皇后，成就新的皇权，并以她昔日的身份和荣耀，助篡位者猖。How to acquire professional skills, no one can deny the meaning of practice makes perfect. Lazy by nature, we are always looking for excuses and trying to avoid practice. One day, Gladwell, author of the best-selling book "Alien," told you: "The reason why genius in people's eyes is outstanding is not that it is superhuman, but that it has made continuous efforts. As long as it takes 10,000 hours of training, anyone can change from ordinary to extraordinary."