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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.I have to say, 33-year-old Jia Min is already a rose that has passed its flowering period, but it still exudes seclusion...For many years, it is worth collecting.《花园酒店》讲述了从军阀混战一直到国共第一次合作破裂之后这段历史时期，爱国商人吴鑫平为了守护国家财产，建造徐州花园饭店，各方势力上演一场民国版夺宝联盟，与各方邪恶势力展开一番生死搏杀的较量。But first reflect on whether your system is reasonable in design.就想着：要是她帮葫芦哥哥做样东西，跟蝉儿师妹的一比，可怎么见人呢？于是，她就耐下性子，跟刘蝉儿一块做针线起来。First of all, Ruiyi has made an inventory of some representative companies in the field of thinking ability training at this stage. According to the learning scenes and teaching modes, Ruiyi can be divided into three categories: online work class, entry game APP and online off-duty class.