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郑氏略一沉吟，道：也好。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:未来世界，科技高度发达，但人类早已无心身边美丽的点点滴滴，甚至不惜予以破坏。某天，政府军队闯入某神秘组织的大厦。经过一番激战，终于将这群邪恶之徒消灭，并在仓库找到了长着一双美丽翅膀的天使。军人恰克和飞鸟眼睁睁看着天使被军方接走进行试验研究，这令他们心中闷闷不乐。经过一番准备，他们乔装打扮混入实验室，救出了失去自由的女孩，全力以赴将她送回自由的天地……一身白色斗篷在和黑夜里格外显眼。一群敬业、热情的老师和一位略显失聪的校长聚集在费城的一所公立学校，决心帮助学生在生活中取得成功。她觉得闺女今儿有些不对劲，便不敢再说了。