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大秦的天下，他们都得给我老老实实的。就火爆一时，而穿越这个元素更是被广泛运用在网络小说中。子房先生。受了致命伤的摩根必须决定是否帮助一个绝望的陌生人，而一个神秘的赏金猎人试图完成金妮没能完成的事情。Those who can read and understand the manual carefully and polish one speech after another according to the methods in it will definitely reach a big level after 10 speeches are passed. I gave myself 80 points for reading the manual. Before each speech, I would read the goals, requirements and skill tips of each project word for word. I would read them at least three times and even make PPT to tell the people around me.The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows: