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(5) When the towing length exceeds 200m, a diamond shape is displayed at the most obvious place.2. Avoid the infinite expansion of the Context, the logic of state switching is distributed in the state class, and the original excessive conditional branches in the Context are also removed.　　Season 4, Episode 6: The Bruce-Partington Plans《布鲁斯帕廷顿计划》27 April 1988The 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 BaiduToni分饰两角——炫酷哥哥和骚气弟弟；Ploy饰演毒舌美女。弟弟某天因为车祸导致不能正常工作，就求哥哥假扮他去上班，结果……哥哥爱上美女，美女以为爱上弟弟的故事就开始了。武林兵器谱，江湖百晓生；飞刀称小李，千里惊鬼神！再现武侠巨匠古龙的飞刀外传，他是一个最强的江湖一流刀客，却也是一个最失意伤心的断肠人，就如同多情刀客无情刀一般，本身就是一个矛盾的组合，却又如此的吸引人。