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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《中华弟子规之孝孝龙奇幻记·弟子规》通过宝豆豆在现实世界和异次元空间“德行村”之间的对比表现，反映出当代社会对待儿童教育的误区，并通过“德行村”这样一个和谐的虚拟世界，向儿童展示出中华民族为之骄傲的传统美德。全剧以在生活中落实《弟子规》为初衷，将《弟子规》中113句行为规范同120集《中华弟子规之孝孝龙奇幻记》动画片的内容一一对应呈现，将中国传统文化的精髓体现在每一处情节之中，并使中华民族的道德传统和精神智慧为儿童所接受，在他们的日常生活中得到践行——这是我们的最终目标！若是燕国冥顽不明，负隅顽抗，汉军将会踏破燕地。所以说，汉王那边现在是危险重重，只是还没有显露出来而已。Please kill in sequence! ! ! Please kill in sequence! ! ! Please kill in sequence! ! !