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Not long after entering the mountain, he found the target and caught the spy. This matter won him a medal.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(3) Open "Open iTunes" on the computer.沙莉的四十岁妈妈患了惧怕长大的心理毛病，她不愿以母亲的身份参加家长会，莎莉只好去卖场买一个新妈妈。（ともさかりえ、麻生祐未饰）1, Chengyan Sichuan secret base materials, soup, auxiliary materials, fresh food materials, raw materials centralized collection and supply, quality assurance.Move在一个大家未知的时空里，有着百年建校史的魔法校园魔女乌龙院里，培养着魔力各异的魔女团体。尚未发现魔力的女主角贝贝在入学后这段时间里却发生了一系列匪夷所思的事件--吸血鬼重现人间、魔女离奇失联，全校唯一的男教师--杰克老师行踪神秘，疑似和魔女们的死对头--吸血鬼女王菲奥娜有着不可告人的秘密。杰克老师的真实身份究竟是什么？努力成为魔女的贝贝能否和魔女们一起打败吸血鬼的邪恶势力？一场魔女与吸血鬼的世纪之战即将拉开帷幕。