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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《掉渣甜》第二季是一部单一场景的情景喜剧，讲述的是一无所有的衰男郝帅，虽然愚笨，但是热爱生活，作为生活中的各个角色，总是在他身上发生各种令人捧腹大笑的事情。而他依然乐观地享受生活。《小戏骨：八仙过海》以1985年香港亚视经典电视剧《八仙过海》为蓝本翻拍。剧情简介：《八仙过海》根据民间传说改编而成的电视剧。据传原来的八仙也是凡人，他们是经过仙人的点化而成仙 的，八位仙人就有八个成仙的故事，虽然他们的经历不同，但却有一个共同点：他们斩妖驱邪，锄恶扬善，造福人类，在世间留下了许多美丽的传说……--Failure, PromptQ: How did you start to take part in the Kaggle competition?这一次更狠了，直接来了个亲密接触，嘴唇擦在她的腮边，整个脸都埋在了她肩窝耳畔。徐正溪新剧名叫《嫣语赋》，很古典很好听的名字，搭档女主乔欣，腾讯古装剧，6月下旬开机，聚禾影画公司出品。俊男美女，希望造型好看些，拍出让人耳目一新的古装剧。