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10-Rhizoma一座冰下火山爆发。一年过后，融冰释放出史前时期的神秘元素，引发了无法意料的后果。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 Baidu2017-07-15 15:33:04傅吉祥，人称傅老大，因父母早逝，他长子为父，带大了三个弟弟一个妹妹，把他们都送进北京的大学。当弟妹们长大成人、事业有成后，他自己却错过了人生的辉煌时期：因没有生育能力而婚姻失败，失业下岗后成为一名足疗师。但他却用乐观精神去面对一切，仍怀有自己的事业和生活理想，成为一名按摩师和父亲。几个自以为生活幸福、事业成功的弟弟妹妹要帮大哥换一个活法，极力安排他来到北京寻找幸福。然而，生活方式和价值观的不同让老大在陌生的大都市里四处碰壁。在目睹了房地产大亨二弟、官迷三弟、房奴四弟、股疯小五的生活后，老大身心俱疲、倍感茫然。但另一方面，老大又能主宰自己的生活和命运，他一直照顾着孤苦无依的梅好和她的儿子乐乐，像一座大山一样成为弱者最坚实的依靠，展现了独特的人格魅力，并最终令众人感悟到什么才是触手可及的幸福生活。三皇子和四皇子都点头，都说这时候应该镇定。