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青木进去二院，门房要留两个跟来的下人吃茶，他便道：不必了，我还要让他们帮忙拿东西哩，就出来。Ctrl + S: save file他对永平帝回禀道：臣并未叫穷，不过是说一件平常的事罢了。Def leaf (address):　　一对情侣外出度假，入住豪宅，然而，当他们半夜醒来，却发现自己躺在一个处处充斥着恐怖氛围的荒弃诡宅中……他们意欲逃离，然而却始终逃不出去，努力奔逃，但逃往的地点却还是这所诡异的荒宅……更恐怖的是，当他们再度回到这座诡宅，却发现，时间跟他们走出去的时间，一样……太精彩了，只是看过电影后，没有人会觉得不精彩，但很多人说出精彩两字后，都不由停顿了一下，然后有些不知道该说什么了。The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu