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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.　　错儿出生在一个思想保守的小山村，由于重男轻女取名错儿（大名明天）。长随头儿胡老大最是了解少爷的心思，知道今儿不打一场不能完，于是率先想葫芦冲过去，狞笑道：你敢打胡少爷？嫌命长了。12. Different from the previous entertainment modes, the border breakthrough mode has its own mode points. According to the combat performance of each player, the corresponding points will be increased or decreased. The better the comprehensive performance, the more points will be increased.他伸展双臂，对身后两人大声道：别怕，抓紧了。　　一场精心设计而又不为人察觉的选拔在民间悄悄展开了，一番阴差阳错之后，柳员外家的四个女子——从小爱舞刀弄枪的千金柳笑笑、爱棋如命的小妾十三姨、厨艺精湛的丫环百灵以及因逃婚而女扮男装的冷秋月进入了龙儿的视线。正当龙儿满心欢喜邀她们进宫共襄大举之际，四个女子却被龙儿的叔叔赵王爷神秘劫走。原来赵王爷和黑泥早有勾结，欲谋反篡权，他慌称太子荒淫无度，邀她们进宫只为纳妾，并称太子身上有七七四十九种怪病，吓得笑笑等仓惶而逃。同时，他又慌报龙儿，称四大高手无意为朝廷效命，故中途逃走。