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The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu在盛唐背景下，那个时代是人类、妖族并存的，然而，人类、妖族的混血儿李玄的出现打破了暂时平静的世界，一场大的阴谋正在滋生，藏在暗处的人蠢蠢欲动，期间，李玄、妖族女间谍苏犹怜、幻世恋人龙薇儿之间的也出现了情感的纠葛……彼时，已经是拯救人类的英雄的李玄却陷入了两难的境地，人族败，母亲死，妖族败，他便为人族叛徒。最终，李玄战胜石星御，破坏长安大阵，释放了被人族囚禁的妖族，一场战争被化解，人妖两族获得了暂时和平，但代价惨重，守护人妖两族，重建长安的责任落在了李玄身上。一个漫无目标的青少年 Frankie 在夏天时面临父亲去世，试图摆脱无聊的生活及负面的自我质疑，因此结交了新的女友，并在网路上认识了一个老男人。就算一跤跌倒，也很快爬起来又跑。2.3. 1 Distance requirements between components and printed board edgesThere are many reasons why feedback weaponization is actively used by bad people, including: trying to suppress competition, retaliating and covering up their whereabouts. The screenshot above shows a black market post discussing how to use Google to beat competitors.