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四十二年伊始，一东一西，两件事情传来，西边，俺答肚子又饿了，俞大猷年事已高，打不动了，就此常任福建总兵，东海无贼，戚继光就此北调去对付他的老朋友。新闻报道了怪盗团事件嫌疑人的莲自杀的消息，同时怪盗团也开始暗中展开行动。为了揪出策划所有事件的幕后人物并让其改过自新，怪盗团决心潜入新目标的魔宫，并盗出宝物。1948年9月，我中国人民解放军攻打济南城，华东野战军某纵队团长毛宝在战斗中和多年前失散的好友陆胜文再次相遇，此时陆胜文已是国民党军的副旅长。王司令员爱惜毛宝的打仗才能，让他将功补过，组建“老虎队”。淮海战役打响，老虎队作为先锋部队，先后攻克了新安镇、碾庄圩，击毙了黄百韬。解放军在民兵队的物资支援下，所向披靡，一路打到了徐州，包围了杜聿明集团。老虎队攻打徐州城，毛宝和陆胜文再次相遇，双方决一死战，国民党军节节败退，毛宝深入虎穴劝说陆胜文起义，陆胜文弃暗投明，兄弟再次联手，消灭了杜聿明的部队，我军赢得了淮海战役的胜利，老虎队的战士们在战斗中一个个牺牲，成为了建国史上的英雄。Memory startup!或者，他们另有图谋，交代你见机行事。If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.