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Football is called "the world's first sport". Football games were once popular in ancient Greece, Rome and China./danceState 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.-Displays the wait dialog box in command line mode;　　去年九月份，《好莱坞报道》称《恶魔岛》描述的是「历史上最神秘、最臭名昭著的监狱：阿尔卡特拉斯」。几个月之后，《好莱坞报道》对该剧的描述又改成「一群阿尔卡特拉斯监狱的囚犯和狱警50年前神秘失踪并在当代出现，联邦调查局派人追踪他们的下落并调查整个事件的真相」。The principle of rescuing the wounded is to save people first, and the principle of rescuing people is to stop bleeding first.