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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离家多年、独自生活的平井，不得不在个人理想和家庭责任之间做出抉择；贝蒂戴维斯（苏珊·萨兰登 Susan Sarandon 饰）和琼克劳馥（杰西卡·兰格 Jessica Lange 饰）都是曾以她们耀耀生辉的星光照亮过影史的女演员们，两人事业和感情上的冲突造成了她们彼此之间深深的矛盾，这段复杂纠葛的恩怨情仇在好莱坞早就不是什么秘密了。杭州、苏州、南京、绍兴、宁波。When it is impossible for a seaplane or WIG craft to display lights and types of lights of various characteristics or positions specified in the articles of this chapter, lights and types of lights and types shall be displayed as close as possible to such characteristics and positions.这么多少年才俊，也不算辱没了她。想到这，又有些痛惜他，便没好气地说道：这事不归我管，去求你爷爷。