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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:　　当时市区发生的火灾现场可能会引起更大的爆炸，就在千钧一发之际，徐天冒死冲进火海，找到正欲逃离的老工程师，一同排除了技术故障，保住了整个城镇。可为此却延误了时机，造成老工程师夫妇均葬身火海……Article 19 [Agencies] Medical security agencies shall abide by the following provisions:4. Detecting SYN Attacks巴虎举起手中的青铜剑，神态乖张。9. There is a "ambition" in the girl's name and a mole on my leg.