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卖不完……卖不卖得完，不是你管的事，你只管加印就行了……先加印五成。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周夫子看着她不语：这姑娘太奇怪了。我画一个傻子才生动呢。The Differences between "Regulations", "Provisions" and "Measures"现在子午谷通道已经探知，那就该抓住机会，尽快付诸实施。