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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.122. X.X.199Tang Guoqiang Spokesman: HK million every 2 years Lv Liping Spokesman: 800,000 every 2 yearsPass on values. The same event can be interpreted from different perspectives, which is one of the manifestations of values. For example, "Jiang Ge's Murder" can be viewed from the perspectives of condemnation of Liu Xin, attitude towards Jiang Ge's mother, hatred of the murderer, etc. Which one to choose and how to interpret it is to embody different values.　　公安部获悉：一代码为”三D“的神秘女子携带毒品的配方及样品秘密的潜入了中国的沿海城市--海阳市，认为该市定有其组织在我国大陆设立的毒品生产基地，公安部命令海阳市公安局务必严查！2017-07-22 15:41:20你家是谁家？既然有胆量赶人，为何没胆量亮出名号？那丫头气得瞪着他不语。