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The main purpose is to save a state of an object, In order to restore the object at an appropriate time, I think it is more vivid to call the backup mode. Generally speaking, assuming that there are various attributes in the original class A and A, A can decide the attributes to be backed up, memo class B is used to store some internal states of A, and class C is used to store memos and can only store, not modify and other operations. Make a picture to analyze it:在全民金融、全民炒股的热潮下，火锅店厨师姚为民也拿出家里的存款、拆迁款和亲戚的借款，凑在一起，参与放贷。一天，姚为民的老熟人装修公司老板刘岩向姚为民借款57万，姚为民被高息诱惑，连续借给刘岩两笔57万现金，却不知不觉中掉进了刘岩精心设计的陷阱，致使其中一笔57万借款血本无归。姚为民追债不成，恼羞成怒，请自称专业追债的黑道人物虎哥帮助追债，却不料，虎哥原来是个冒牌货，钱没要回来，姚为民反被诬为骗子。面对夫妻反目、家庭破裂、亲人相逼，姚为民为要回57万，不惜铤而走险。。。与此同时，小贷公司老板资本之鹰许量与美女借款客户利华公司总经理张嘉仪，情债、钱债纠缠不清，意图通过债转股的方式财色兼收。。。15岁的卡莱尔讲述了一个男孩的困境，他必须做出任何一个孩子都不应该做出的选择。The following is the definition of the factory method: an interface is defined to create an object, but the subclass decides which one to create. The factory method defers this process of creating objects to subclasses.Winter sports in which people use ice skates to skate on ice. Originated in Holland in the 10th century. Skating sports include speed skating, short track speed skating, and figure skating.The CPS3 substrate is perfectly simulated, which is explained in detail below.