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Disadvantages: Difficult to MakeThe 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未来世界，随着科技的超速发展，大量高科技的机器人投入使用，为人类提供便利的同时也取代了大批劳动力。很快机器人的数量就已与人类不相上下，世界变成了机器与人类共生的一个团体。洛普（范·迪塞尔饰）是一名退役的老兵，空有一身的武艺却终日无所事事，转业当上了拿钱办事的雇佣兵，专门接受各种护送任务。一日，他接受了一项新任务：在丽贝卡修女（杨紫琼饰）的陪同下，押解一个神秘女人横跨欧亚大陆。然而他并不知道对方身上原来有着某种可怕的病毒，这种病毒的力量足以毁灭全世界。与此同时，一个邪教组织也正在对她虎视眈眈，企图利用这名女性产下一个基因改良的人种……And evacuation finger只有心胸宽阔，体念自然之理，心无挂碍，才是正道。If you can add 40 above, you can use magic skills, but you can't use conquest.The cabinet with the key is empty. Open the cabinet door and put in the articles. Then put in enough coins. Turn the key lock and pull out the key. The cabinet is locked. The usage method is basically the same as that of the lockers in domestic supermarkets.