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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两人听了心领神会，相视一笑，都点头道：好。不然，这玉佩赔出去了，等菊花姐姐回来了，看不骂你。他发现，今天不是个欺负人的好日子，对方人多势众，又在人家门口，只好色厉内荏地端出靠山来。Adult Swim宣布预订15分钟剧《#忙碌黛布拉三连# Three Busy Debras》，这部由Amy Poehler制片公司Paper Kite Productions负责的剧于下半年开机拍摄。此剧由Sandy Honig﹑Mitra Jouhari及Alyssa Stonoha三人主创﹑执笔剧本及主演，剧中讲述三个有点疯﹑每天都十分忙碌的家庭主妇，而她们的共同点是都住在康涅狄格州的富裕郊区小镇，以及她们都叫Debra。For example, if a crazy battle uses 450 to attack 17 and 455 to attack 12, the latter will definitely have a higher attack.After saying this passage, Zhao Mingkai's eyes looked at the light in the interview room and fell into a silence. I knew that he was thinking of sad things. He tentatively asked him how Zhou Xiaolin was doing later. He sighed deeply and said with a regretful tone: