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The small TV on the right is connected with PS2 XBOX360 and MiniSFC.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《爱你西蒙》的衍生剧#爱你,维克托##Love,Victor#获得第二季续订！　　《蚁族的奋斗》堪称“奋斗版的蜗居”，讲述的是时下草根青年艰辛的奋斗史，为此制片方银润传媒坚持要用年轻演员，而不是让大龄演员来“装嫩”。但是目前国内影视一个富裕、雍容华贵的中年寡妇跟一个比她小15岁的园丁之间产生了感情，但是社会地位的悬殊向她施加巨大的压力，连她的子女都 无法接受。她不得不向可畏的人言低头。但是最终她依然向社会陋习挑战，走上感情之路。 　　尹旭不禁有些羡慕，心想有个贴心的女人真好，一瞬间几道美丽的倩影从眼前浮过。