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2.4 Employee ParticipationThe 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　FOX宣布预订《清洁工 The Cleaning Lady》，这部剧改编自阿根廷剧，由Miranda Kwok负责剧本，剧中讲述女主是个机智的医生，她来到美国寻求医治生病儿子的方法，然而美国却逼使她躲起来不过她决心不会就此屈服，并转而投向黑帮当起解决问题的「清洁工」。秦旷听得目瞪口呆。Props used on miners will turn miners into ghouls or ghosts, and ghosts will be killed until 5 ghouls are created.