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The disadvantage of state mode is that many state classes will be defined in the system. Writing 20 state classes is a boring job, and many objects will be added to the system. In addition, because the logic is scattered in the state class, although unpopular conditional branch statements are avoided, it also causes the problem of logic dispersion, and the logic of the entire state machine cannot be seen in one place.6. Copy down your favorite sentences.两人就往左边一个洞室去了。两个自认为运气极差的哥们在别人的说服下决定去度假。当他们到达哥伦比亚后他们意识到他们必须在没有军事训练的条件下去抓住美国的头号通缉犯韩信立即解释道：大王莫要误会，韩信只是个一个将帅，职责就是带兵打仗，若是不能带领大军，岂非辜负了汉王的重托。Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.徐宣还好一些，至于这徐彤简直就是家族长辈溺爱的结果。