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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翘儿美滋滋一乐，挎着篮子穿过人群走到圆圈中心来。与他的员工们非常不同的是，一个狂热的迈克尔已经迫不及待地等待今年的邓迪奖了。蒯彻没有犹豫，当即道：承蒙韩元帅高看，元帅雄心壮志，蒯彻有机会置身其中，何其乐哉。说完，又将那卷纸递还给她。(3) When moving towards water, in addition to the lights specified in item (1) of this paragraph, mast lights, side lights and tail lights shall also be displayed;Only construct the request and do not care about the request result, that is, close the session immediately after sending the request;