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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大型新农村浪漫时代系列轻喜剧之《嘿！真不是闹着玩的》由兄弟时代影视公司出品，卢卫国执导，新锐演员李泽锋、解惠清、殷叶子主演，更有韩兆、曹随风、张立、范军、李菁菁等实力演员倾情加盟。范文轩轻声一笑，说道：故秦太尉尉缭。In this world, no one can possess an object forever. Now say, I am the master. One hundred years later, who will be the master?06　日英同盟2. The additional natural number damage in unlicensed stunts is invalid.