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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芭比之美人鱼历险记2是芭比之美人鱼历险记电影的续作，芭比之美人鱼历险记2全集动画电影主要讲述的是梅丽娅的冲浪对手凯莉释放了艾丽斯，却被厄里斯扔入漩涡，梅丽娅救了她后，凯莉决定与梅丽娅一起打败艾丽斯拯救海蓝国，在关键时刻，梅丽娅在朋友们的帮助下打败厄里斯，参加潮汐庆典，做上女王宝座，接受海洋力量，最终拯救海洋王国，并顺利和凯莉一同获得冲浪女王奖杯。惊险的旅途，激动的时刻就此展开！玛雅·鲁道夫是莫莉·诺瓦克，一位准备拯救世界的亿万富翁。Loot将于6月24日在Apple TV+上首播。1 can buy 2 can go back to Black Front Fortress. There is a blood elf dead rider in the flight administrator. You can buy 3 900 gold from there. 4. You need to learn riding skills. Tribe can learn from Salma. If you can't afford the 900 gold mentioned above, you can buy 50 gold alliances here. I forgot 5. You can't fly wherever you want. You have to learn to fly on the mainland to fly everywhere. 6 big birds are mounts with 310% flight speed. 150% Speed Adoption在续集中，除了马里子攻略男性的恋爱技巧、麻里子华丽的七大变化、为被男性哭泣的女性复仇等令人毛骨悚然的故事之外，还将有与香甜复仇社敌对的Bitter Revenge社登场等新的展开。I. Introduction科学家艾莉·爱罗薇从小就对外太空感兴趣，并用无线电接收其他地域和空间的信号。长大后，她成了一名从事外太空生命搜索的专家。她对宇宙生命充满探索欲望，尤其是对她产生深远影响的父亲去世后，她对科研的投入更加上了对父亲的强烈怀念。