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……戚继光表情尴尬，憋了半天只吐出八个字，练兵为重，利器为先。宫廷画师陆九卿意外用神笔打开画中世界，与草木精灵颜歌相遇。城内女子面容接连被毁，为查明真相，二人进入生死墓。妖王剥去众草木精灵面皮，丢失美貌的颜歌变狰狞枯枝，一场皮囊与真心的考验，摆在陆九卿面前……官方宣布第六季你这样阻挡，到底是何居心？小葱点头道：这位前辈说的对。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