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只能暂时缓解疼痛，一个时辰后，还会发作。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何永强劣迹斑斑，跟他结交的人，在家庭伦理方面通常不会有什么好下场。单身的生活并非你想象的那样，三个单身狗不同的职业讲述不同的单身生活。《丈夫[1] 》泰剧剧情简介：在爱与恨的交织下,在口与心的纠结中,名义的"丈夫"能否收货真正的爱情,名正言顺的拥抱自己的爱妻,一生陪伴到白头。For each field of education, * beneficial learning goals are those that help students create effective psychological representations, which is also where deliberate practice methods are more effective than traditional learning methods. This book illustrates the prospect of deliberate practice with the growth cases of many real characters, which is refreshing.Abstract class Wrapper2: