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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我也瞅那小子不顺眼……郑氏气道：还说呢。少爷要是知道押出去这么多银子，也一定会拼命的。6.2 For exampleMove　第三季将自上季结尾的三个月后讲起，随着乔瑟芬婶婶去世后，莉安始终摆脱不了阴影，疑神疑鬼的现象也越来越严重。至于已接回男婴的透纳一家则期望过着正常的生活，这个心愿看来遥遥无期。周菡虽满脸羞红，心里却极甜蜜柔软。