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The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.大家被他吓了一跳，陡然沉静下来，听了后面的话。圣诞老人是圣诞节的象征，传说中的圣诞老人会在圣诞前夜驾着由驯鹿拉的雪橇，将礼物送到千家万户。然而，随着人类社会的不断进步，已经没有什么人再相信这个流传了很久的传说，没有人再相信圣诞老人的存在了。然而，小男孩克劳斯(乔什·哈切森配音)却不这么认为，尽管他的父母和周围的朋友都告诉他圣诞老人只不过是个虚构的人物，他本身根本就不存在，但克劳斯却坚持相信圣诞老人的存在，因此，克劳斯经常会遭到同伴的嘲笑，但他始终没有动摇他的信念。那病情不但没有缓解，反而加重了，至天明时分。一手揽住她的腰，这才没出事。化工宅男密尔顿自认聪明过人，不敌美色诱惑的他，自告奋勇帮忙刚认识的正妹丝凯勒与她的男友罗素製毒赚大钱。三人选在杳无人烟的深山小屋製毒，却发生激烈衝突，混乱中罗素遭箭命中要害身亡。保住小命的密尔顿暗自窃喜能接收正妹，殊不知一觉醒来后，罗素竟又活生生地站在他面前...When I heard this, I coughed gently and motioned for his words to be a bit off the topic. Wang Zeduan was embarrassed at first. Looking at his expression, he did feel that what he said had nothing to do with the topic, but then he smiled and didn't care, but went on to say: