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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.歇洛克·福尔摩斯的药物成瘾的根源来自他的内心，在自己和华生医生的努力下，他暂时摆脱了毒品。可是，问题并没有消除，只是潜伏下来了，并且潜伏得很深。在第三季季终，福尔摩斯不幸复吸，其父听闻这一消息后赶往纽约。华生则在丧偶后回到福尔摩斯身边。　　但其实，他们四个是为了好寻找理由及藉口甚至把柄，作为反对桃花恋爱的手段，因为他们打从心底相信，这世界除了他们四个之外，没有任何男生够资格匹配他们最爱的妹妹，桃花……Shanghai!水满则溢，月满则亏，惧怕到了一定程度就可能变为反抗，现如今齐楚之战正是如此。It's not shameful to be a female, and you have to bear such a family, everyone will only sympathize with you. The problem is, it would be unwise to be a female and offend the gold owner.