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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 BaiduWhen traveling to Nagoya, the most convenient and fast mode of transportation is the subway. Nagoya's subway system is relatively developed, but it is not as complicated as Tokyo.1In line with the concept of "one cannot be less".小鱼儿上了龟山，这时，小说中叙述的视角便转到了花无缺身上。The weapon is a very common Wang Yanzhang suit, which cost about 200,000 yuan, as follows:故事本身讲述政府成立秘密组织“花生酱三明治”(PBS)，支援女性的婚活，并会以当中的数据进行解说。组织成员包括新人研究员兼潜入搜查担当椿（矢作穗香），数据至上主义的前辈研究员小林（伊藤健太郎），谜次所长权田（伊藤修子）。他们每次都会找来4名女性，进行监视及进行分析，得出结婚机会率及恋爱进展可能性等数据。