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Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:全剧共5季63集，于2001年6月3日至2005年8月21日在美国有线电视频道HBO首播。8-5 Cities: Write a function called describe_city () that accepts the name of a city and the country to which the city belongs. This function should print a simple sentence, such as Reykjavik is in Iceland. Specifies a default value for the formal parameter used to store the country. This function is called for three different cities, and at least one of them does not belong to the default country.该剧讲述了“励志三婚女”王小幸与“一手高富帅”丁学琪之间非同一般的婚恋故事。List of Hourly Minimum Wage Standards in All Provinces and Cities in China早在那时，整个东南亚几乎就是大明的属国了。