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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钱明朝地上呸了一下道：老子怕个鸟。　　Sam Levinson执笔的《亢奋》讲述在一年前有名青少年在夜总会外 被谋杀，而悲剧发生一年后其他青少年同伴试图通过毒品﹑性爱和暴力来逃避现实，以应对无法确定的未来。由岛崎遥香主演多次被已婚男骗而发生婚外情的前园小春,剧情为主角带着重新开始的想法回到可以一夫多妻的故乡,等待她的却是成为龙之介的第3位妻子前提下的全新恋爱！反正是死马当活马医，况且现在就根本没有资格和人家讲条件。