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小鱼儿和魏无牙展开了对决，小鱼儿武功大进，但是与魏无牙相比，还是有些差距。Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:青年人总喜欢追逐梦想，坚持自我！然而在成长岁月中，有人会因种种经历、挫折、磨练，渐渐失去棱角，亦有人能够坚持信念走到最后。几位八十、九十后青年男女，因为种种现实因素被迫放弃昔日理念，最后他们又能否凭着对单车运动的热爱，重拾昔日的冲劲，重新出发，寻回人生方向？这解释不通啊。"I can't die, and I have repeated every song of his 18 times in a single."