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至于到城外没放你们回去，那不是情势不由人嘛。秋香情意绵绵，一双美眸里全是唐伯虎。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(1) What is Event Bubble爱无价（2011年纳瓦·君拉纳拉主演泰国电视剧） 即 人的价值 （2011年泰国电视剧） 。This.leader ();The way to finish the work is to cherish every minute. -Darwin