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Source: Brother Guo此剧以医院急诊室为背景，讲述医生、护士和患者之间，围绕着生命进行拼死奋斗的温馨故事。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:所以为了虞姬能够坦然无忧地生活，接受霸王的关爱，还请霸王尽快和亚父和解。黑汉子慌了，又不敢去打扰书生，好容易捱到天明，才派人去送信，问要不要给玉米请大夫。戚继光没有接过文书，愣愣答道：这个大娘给城门卫兵，我只是个路过的。First of all, the 10,000-hour exercise must be targeted, with feedback and correction, but it will become mechanical repetition. The seeds sown did not grow into towering trees, but only got a pile of weeds.