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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:Men's and women's singles and doubles respectively.Through the screening of films on safeguarding rights in rural areas, improving farmers' legal awareness and enhancing farmers' legal concept are the spiritual factors for the sustainable development of rural society and the arduous task of rural legal construction. Farmers' legal awareness will directly affect the process of building a new socialist countryside.Eason and The Duo band 在中环摩天轮举办的露天慈善show，歌单囊括了两个月后新砖的大部分歌曲，还有Yoyo的新歌《尽力呼吸》当一名穆斯林在比利时去世时，他的亲戚陷入两难境地：“我们是把他埋葬在这里，还是把他带回出生地？”伊斯玛尔找到了一个解决办法：“从摩洛哥带土壤来埋葬死者怎么样？我们可以做土壤生意！”不知不觉中，一群人打开了潘多拉的“棺材”。(Ha Xuesheng, Director of Program Department of CCTV Financial Channel)