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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:BT in BT investment mode is the abbreviation of build-transfer, which is a kind of rich investment mode created or simplified by Yan Jiehe, a dark horse tycoon on the 2005 Rich List. Compared with BOO (construction-operation-operation) and BOOT (construction-ownership-operation-transfer), BT investment mode has less operation link for the construction party. Its essence is the transformation of BOT (build-operation-transfer) mode, which means that the project management company advances funds to carry out the construction after the general contract, and then transfers the construction to the government department after the construction acceptance is completed. That is to say, advance funds to build infrastructure projects that the Government cannot start for the time being, and then let the Government repay in installments, thus making huge profits.　　“大话王”赵德兴（郭晋安饰）因一次意外令生意搭档蒙一言（谭俊彦饰）头部受伤并失忆，赵德兴要在24小时里帮助蒙一言找回记忆，以此为主线串联起种种社会荒诞现象和人物。谁料他正在训练的时候。为改变传统训练模式，华东战区组建全军第一支专业化蓝军部队——山豹旅。山豹旅首次亮相便与王牌师808师与909师先后对抗，蓝军以出其不意的非正常出击，打得两支传统王牌军狼狈不堪，在军中掀起轩然大波，同时其“出格表现”引来不少非议。蓝军顶着各种议论和压力，不断提高自身队伍建设，在跨军区演习中打出了自己的声望。次年，红蓝军再度对决。经历一年多的知耻磨砺，808师以全新的面貌迎战，终不负众望，取得全胜，充分证明了蓝军一年来的努力和成绩。经过不断的艰难探索和建设，蓝军作为一个全新的兵种终于确立在人民解放军序列当中，并得到广大官兵的认可。曹邦辅沉声道，俞总兵本就是负罪之身，唯有靠眼前的战事戴罪立功，若是这种时候再怀念张总督，传到一些人耳朵里，谁也保不了你。In subsequent interviews, I found the only squad leader at position 142 at that time: Zhao Mingkai, the squad leader is not an officer in the army, Not cadres, But as the backbone of the team, Having the title of "Mother of the Army" is the soul of a class and plays a far more important role in the battle than an ordinary soldier. Therefore, from his perspective, compared with other ordinary soldiers, he has a relatively large depth and breadth. In the interview, I did find many different things from sorting out his memories.