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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杨长帆双掌一拍，就此信口开河，我这边传出消息，徽王招亲，选美，选贤，无论出身贵贱。Then Sun Jian's first level of health is 6860+1200=8060Smoke bombs before burning:跟随本片一窥《离经叛道》的制作过程。这部电影真实描绘和探索了哈西德派社群女性所面临的问题，是同类题材的开山之作① INFO