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关于一位东北民间萨满巫师的纪录片中军大帐里，尹旭表情严肃道：齐国出兵的消息你们也知道了，这个时候攻克荥阳城并不容易，有诸多障碍。2. Damage cannot be protected by Invincible Skills and Gods.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黎章对他微微一笑，抱拳道：恭喜胡兄高升。Let's use the traditional object-oriented pattern to design the code first:In order to actively respond to the national policy of upgrading the cultural tourism industry, improving quality and increasing efficiency, and to strengthen the "Charming China City? The horizontal ties among the members of the" City Alliance "have enabled the city to complement each other's advantageous resources and send tourists to each other. The" Charming Card "program has been officially launched. It will take covering 300 million potential consumers and realizing 100 million registered users as its initial goal, quickly occupy the tourism market, build the preferred platform for quality tourism, and open up new formats for cultural tourism.