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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.就这样，每天追看《佛本是道》，嘻嘻闹闹调侃其中剧情，时间不知不觉溜走，三月走向终点，四月悄然来临。Chief mate, Gong Xuejun and Ding Yumin, interceded while scolding, slowly swam far away, and the three hugged each other. They will definitely not live. Domestic life jackets will not work. Once soaked in water, they will sink in four or five hours. Moreover, they will bleed and sharks will come quickly.://2s.c0然往事话长，其间曲直一言难尽，何况也理不清。好吧。《燃烧》讲述了抗日时期，一个 神秘而性命攸关的“保护破译的密码 本”任务牵动着土匪、黑店老板娘等一 系列的小人物角色的命运，大家经历 了重重困难险境甚至牺牲了自己的生 命，最终把这个看似不可能完成的艰 巨任务完成了，每一个人都是被历史 铭记的抗日英雄。