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Now there is an abstract PizzaStore class from which other classes can extend and override their CreatePizza methods.不是能摸到鱼就是鳖，有一次还抓了一条水蛇。Since it is called, as the name implies, the front section is separated like toes. Of course, this is not just for the sake of good looks. There are other functions and ideas. We will talk about them later.　　反黑帮双雄王志淙（黄日华饰）与林永泰（陈锦鸿饰）同属O记部门，二人性格迥异，因此时常发生争执，但在工作上却不失为一对好拍档，是名副其实的欢喜冤家。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日本秋名山上的清晨，一辆丰田出产的中古车AE86优美地在下坡道飞驰，车内神秘车手的漂移车速使人吃惊。AE86在藤原豆腐店旁停下，睡眼惺忪的少年藤原拓海回到店里，只见老父藤原文太醉倒厅中，拓海帮父亲收拾东西，忆起每天清晨代父送豆腐到秋名山上的旅店，心情也沉重起来。"What is that big wasp?" I asked.