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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.Printed with the logo of the polar fruit net, there is also a small key chain, budding ~Gas theory: Flame retardant releases incombustible gas at high temperature and dilutes the combustible gas released from combustion to below the combustion concentration, which has the effect of gas dilution. The dilution of different gases is in the following order: N2 > CO2 > SO2 > NH3.In her work, this severity hurt her interpersonal relationship, her marriage and, in the end, herself.　　一个出生在画栋雕梁深宅大院的康梦凡，日日夜夜站在望夫崖上，只为等待一个生在冰雪苍茫原始森林中的夏磊。所有的悲欢离合，也只为验证一句老话“山可移，海可枯，此情永不改”。