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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.　　以她崇高的地位、超人的智慧、不凡的毅力和往往让人不能理喻的特殊性格，每每使奸臣的阴谋不能得逞，使朱元璋的错误得以修正，使一些利国利民的 措施能够实行……Organization and Arrangement in MDT MeetingsAfter retiring from the factory, Li Lei's mother stayed at home completely, derailed from the society, had no friends, and could not even complete the basic survival skills of going to the bank to withdraw money and buy vegetables. The family once took their mother to see a psychiatric department, but because of the reaction and discomfort of taking medicine, they let it go. Because of his mother's condition, Li Lei began to read psychology books when he was in university, studied psychology degree, and also took the qualification certificate of psychological consultant. But with this knowledge, Li Lei also failed to help his mother live a better life.退休军队老干部葛定国同志被组织“管理”了一辈子，退休后突然改变了主意，把“为自己活一把”，硬是和战争中结合的老伴戴冰离了婚，找了个比自己小二十岁的老伴苗岭秀，结果带来了一系列家庭问题，生活从此变得充满幽默……葛家儿女共三个，都是葛定国同志与前任妻子戴冰革命浪漫主义的结晶，他们对于父亲的选择，各自态度不同，老大南征是铁杆的保妈派，对老爷子大打出手；老二北战是个利欲熏心的商人，自己的事都忙不过来，哪有闲工夫去管老爹的事；女儿老三西西最孝顺，也是父亲的心头肉，却与父亲的小老伴水火不容、针锋相对，由此产生出了无数故事……还真有几分道理。上课，做系活动在“那个房间”开放学后的茶会……