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Therefore, learning design patterns, The first thing to do is to understand which aspects of design patterns are available to developers, Then, the principle, timing and method of each design pattern are studied respectively, that is to say, under what circumstances should a certain design pattern be used? When understanding the timing of a certain design pattern, it is also necessary to understand what consequences will be caused if this design pattern is not used at this time. After understanding the principle and usage of each pattern, more importantly, learning the object-oriented thinking mode, after mastering the object-oriented thinking mode, looking back at the design pattern, you will have a deeper understanding. Finally, learning the design pattern, you must study hard and practice more. "I agree with the last sentence very much.""Yes, it's the kind of big rats. They are more difficult to deal with than big wasps. Especially when these two things go together, one is in the sky and the other is underground. We should be too busy to take care of them. Moreover, the kind of big rats have very strong teeth. It's a piece of cake to bite off their arms and legs in three or two, and they move very quickly." Zhang Xiaobo said.作为地球上来的人，经历过武侠小说最辉煌的时代，《射雕》或者《小李飞刀》这样的名作明珠暗投，陈启肯定不能接受。他们以为他死了，才使手段帮他回张家的。特勤中队长陈二喜是一名响当当的消防英雄，在一次灭火战斗中，二喜冒着生命危险从 高层住宅救出了年轻美丽的女记者 安琪，二喜身负重伤。经过一场生死的考验，二喜与安琪渐生爱意......后来黄河泛滥日渐加重，泥沙淤积严重，出现过多次的决口和改道。夸父惊闻赤练火被黄帝之女轩辕妭夺走,那赤练火与天上日月一脉相连太阳因此无光。在追回赤练火过程中夸父却与轩辕妭日久生情。最终为保天下氏族能重获太阳,夸父放手让轩辕妭化身为新的太阳,留下夸父逐日的传说。