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Amazon宣布续订《#无垠的太空# The Expanse》第五季！那嘴角就不由得翘了起来。① INFOAwatsaya，一个漂亮拥有光明前程的女人，大概35左右期待着一直单身。直到和新雇佣的性感的年轻人Pran开始秘密交往。Pran是一个完美的男人，刚被伤了心，帅气，有才华人也很友好。但是Awatsaya不会让她的地位和形象受到影响，所以她通过在线交谈和他约会，他们的关系发展顺利。但是当另一个人MrLipta试图盗窃她的在线身份的时候一切开始乱了。Mr Lipta是Awatsaya的新boss，他喜欢捉弄她，但是她不知道的是，这个帅气的boss一直暗恋她。徐海举目四望，杭州城如今已是滚滚浓烟，就是这样。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: