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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:众人都笑着表示，一定要把他编进去。Russell and Finlay must confront a serial killer case from their past while working in Seattle when a copycat killer suddenly emerges in Las Vegas./surprise《复仇者联盟3：无限战争》是漫威电影宇宙10周年的历史性集结，将为影迷们带来史诗版的终极对决。面对灭霸突然发起的闪电袭击，复仇者联盟及其所有超级英雄盟友必须全力以赴，才能阻止他对全宇宙造成毁灭性的打击。靠，你要敢杀我，我就自杀。内蒙古鄂尔多斯市准格尔旗公安局长郝万忠英年早逝后，以新华社记者沿着他的人生足迹采访其亲人、同事、工作对象的过程中再现出了一个见不得百姓受苦、嫉恶如仇、在工作干为上尽职尽责，充满了情怀的公安局长形象。