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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那些花钱雇你们的人该放心把你们的消息告诉官府了。然而凡事都不能冲动，都该从大局着想，不能为之了一时之气，置西楚国的安慰与不顾。等头梳好了，这脸上的奶也能擦干净了。青虚观门徒贯晓钟见色起义，意图不轨。杨赞廷等人正好路过，遂决定以此事为由，到江湖上宣传昆仑派德恶行。贯晓钟偷看女尼洗澡，其师妹宋满儿前往尼庵劝阻。杨赞廷、甘瘤子正欲对宋满儿发动攻击时，却遇天池、桂武、联珠等敢到。联珠见是父亲甘瘤子，立刻长跪不起。甘瘤子见是女儿拦阻，大怒，欲伤联珠。桂武等连忙救下联珠。几人联手仍不是杨赞廷对手。危机时分，桂武之马通灵，急驰而去接红姑来助阵。红姑赶到，杨赞廷等人于是败。约为儿女秦家，项伯有些突兀，在张良的劝说下边稀里糊涂地答应了。The advantage is that the coupling between the sender and the receiver of the request is eliminated.