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2. Different materials and processes:流犯更应该戴罪立功才是。The lineup of the instructors is also worth looking forward to. The national producers of the program are Huang Zitao, the dance instructors are Luo Zhixiang and Wang Yibo, the music instructors are Zhang Jie and Ella, and the creative instructors are Lin Youjia and Hu Yanbin.State mode refers to allowing an object to change its behavior when its internal state changes. The object seems to have modified its class. Divide this sentence into two parts by commas. The first part means to encapsulate the state into a separate class and delegate the request to the current state object. When the internal state of the object changes, different behavior changes will be brought about. The second part is from the customer's point of view, the object used has completely different behaviors in different states. The object seems to be instantiated from different classes, but in fact this is the effect of using delegates.According to the memory of Liu Guangyuan, a soldier who personally participated in the battle that year: