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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:女孩向美兰是“山窝窝飞出的金凤凰”，有着一份令人艳羡的爱情和前程。为毕业设计，她和富二代男友回到山乡，目睹美丽乡村的日渐凋敝，选择留下来将古民居改造成“乡村民宿”。创业路上，她遭遇封建迷信的干扰，传统势力的阻碍，村民的误解和爱情的波折，历经磨难，将乡村文明与都市文明相融合，令古老的山村重焕生机。主动退了一步，那末将暂且退下。(2) Out-of-pocket certificate (multiple certificates of the company): If you are not sure, please do not pay directly: call 025-96010 for inquiries. Click to enter:　　凯丽早已对阿羿拼命工作，无暇顾及家庭产生不满。一日又因凯丽与前男友道别时被阿羿看到，两人误会加深。可惜阿羿此时需进营集训，更使凯丽对两人的感情感到心灰意冷，遂决定从阿羿的住所中搬出。1. Introduction to Publish and Subscribe Mode人家老爹都这么说，那自己还有什么可说的呢？再次轻咳一声，说道：那好吧，绿萝……啊，现在有那么几件事情可能需要麻烦你一下。