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Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.故事讲述英国裁缝 伦纳德（马克·里朗斯 饰）曾在世界闻名的伦敦萨维尔街做西服，但在经历了一场个人悲剧后，他来到了芝加哥，在镇上一个简陋的地方经营着一家小裁缝店，为周围唯一能负担得起的人制作漂亮衣服：一个邪恶的黑帮家庭。CC1, …胡敦忽然眼珠一转，冷笑着对板栗、葫芦等人道：真是好威风、好气势。你爹娘他们和玄武候也要进京了，有他们在，你不用操心了。　苍井优将主演东京电视台秋季深夜剧<这个漫画很厉害！>，著名纪录片导演松江哲明执导。After returning home, many students asked "what have you gained from the three rural areas". What I want to say is "some things can only be understood after experiencing them. Some gains are not at the end but in the process". At present, we are still not students who have gone out of school. We always have many lofty ideals and aspirations. Just like me, I am a freshman, and I always think that I can make great efforts in those developed cities after graduation, and my heart is higher than the sky. I don't think there is anything wrong with this. I have always classified this idea as my personal desire for advancement. But after this trip to the countryside, I seem to have realized something different. Everyone is diligent, everyone expects themselves to work in prosperous areas and enjoy high treatment, which is understandable. However, those who know how to repay the society and spread their light in poor areas are extremely noble. "Three Supports and One Help" is a very good policy to enable more college students to have such opportunities to shine.