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Let's look at the above picture first. It is three short video apps. It can be seen that although the content types are the same and the product forms are similar, the different contents displayed will give users different feelings.在处理了她去年的行为所带来的影响后，华盛顿特区的丽莎·阿姆斯特朗被要求协助莫尔坎贝的谋杀案调查。During the installation process, if there is no Pip, Python needs to be installed first and then Pip needs to be installed. The process is as shown in the figure:又抬头对魏铁和黎水道：眼看就要到夏天了，你们俩也不用脱裤子，光着膀子一亮相，看谁往后还敢说你们不是男人。周三（2/21），NBC正式宣布续订喜剧《百味超市》（Superstore）第4季，共22集。年轻的侦察员、“名副其实”的新一代的女特警魏次芳刚刚离开特训学院，就开始了她的特别侦察（卧底）生涯。为了完成任务，她以不同是身份和职业为掩护，深入各种犯罪集团的内部；她扮演着各种不同的角色（大学生、打工妹、白领、运动教练、服务员、保镖等），凭借顽强的意志与过硬的本领，与形形色色的犯罪分子斗智斗勇。然而，就在她打入犯罪组织的时候，却意外邂逅了一个名叫吴同的男人，让她第一次尝试到男女间的最美好情感……可这个男人却与犯罪集团的女人堕入情网。魏次芳看起来如此柔弱、轻盈，但她却有坚韧的内心和钉子般的决心，她执行的每一项任务，其实就是要让许多吴同那样善良无辜的人从欺骗和危险中解脱出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: