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The above screenshots come from the official website.嘿嘿，等这部小说发布后，……陈启脸上浮现出笑容，他已经能想象到这部小说发布后，会给大众带来怎样的震撼。　　一九四九年解放战争后期，冷江解放受阻于鹰嘴战线，战斗转入傅品千领导的地下战线。我地下党医院院长傅品千潜伏冷江数年，在解放前夕，保密局特务们疯狂反扑，傅品千与打入敌人内部的“小蜜蜂”紧密配合，步步行险，在没有硝烟的战场上与敌人做生死周旋。胡说。胡老大和葫芦哥同受重伤，一块被送进医馆。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