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时间管理局是一个自治且神秘的政府机构，直接听命于政府最高负责人。只有国王，首相以及极少数人知道。去往其它时代需要通过由政府巡逻队守卫的一道门。其目的是检查和阻止任何对过去的侵入影响我们目前生活或相反的行为，这些行为多是为了一己私欲而利用历史。为此，巡逻队需要去往过去，并阻止它们的发生。停下喘气，立即提高声音。其实他们都没有注意到，西楚霸王项羽的拳头早已握着咯咯作响。219. X.X.30虽然并没有季木霖说的‘狗爬的那么邪乎，但比起章法分明、华子遒劲的楷体字，确实显得普通了一些。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: