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Add the following code to "TestSpring":明明应该幸福地生活着，在我的内心深处，却是一起度过青春时代的同级生？廉一直在睡觉。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 BaiduPancake和Vee的第三次合作！Death Challenge-"Battle Summoner" Oru orders players to duel with 5 Death Knights and win. You can choose to fight with Death Knight recruits or players, fight with NPC dialogue or fight with players, and win 5 games to complete the task.治愈系小短片。整个世界都灭绝了，人类也消失的无影无踪.没有动物，没有桥梁，没有青山， 也没有绿树。只有蓝蓝的天空，和流动的空气。你只能远远看见一家破旧但是完好的房子，标示上面写着“糖果铺 “在屋子里面有一个巨大的糖果机器， 里面盛满了上百颗糖果。对于Zelly 杰力们来说，追寻糖果是它们一生的命运。喜欢吃糖果是它们的本能驱使。裁制银币，制作炸药，但是糖果机器就是无坚不摧， 从来就不能被打开或者被破坏。也许，糖果就默默得躲在背后，它们最后能吃到糖果吗?我们要尽量做好江东这边的招牌，加强在北方宣传，这样才能吸引更多的人前来。