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杨长帆果断把最后一步工序交给那位老兵，指着火信道，你把这里点燃就可以了，开第一炮的光荣，应该属于您这样的老兵。　　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　　她雇佣私家侦探，找到了本以为会“老死不相往来”的前男友们，频频制造“啊，天呀！是你！”的“偶遇”。随后她发现昔日的恋人们如今真是包罗万象——牧师、同性恋、精神病、罪犯、成功人士等等——可谓“没有最极品，只有更极品。”一出出让人捧腹大笑的闹剧由此上演。"..."　　版本二