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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:1943年，特种兵部队奉命深入敌后摧毁日寇大规模杀伤性武器，却遭日寇设计而全军覆没，队长尤龙的遗孀周至柔的小妹周志卿，奉国民党军统高层命令查清此事。调查过程中，周志卿身陷险境，正巧被我地下党人赵凯所救，自此一见钟情。两人通力合作，经历重重险境。周至柔是国民党特种部队“猛龙”大队大队长的妻子，中共高级特工，在“猛龙”大队被日本间谍告密而全军覆没后，她同时执行查处奸细并摧毁日寇的任务。当他们终于查出了真相，并摧毁了日寇的大规模杀伤性武器时，更为严峻的考验接踵而至，日寇的惊天阴谋渐渐浮出水面，而最危险的日谍“枭”仍然潜伏在他们身边……尹旭这么一说，众人全都明白过来，短时间内是指望不上越王封官什么的了。An event can have many listeners attached to it. These listeners tell the system to call my XXX method when the event occurs by registering their own event handling routines."Waking up" is not a simple game project, it is intended to help the experiencer think ahead of time about how to face the death of himself and his relatives through "life education".故事从赵峰高三分班考试进入1班开始讲起，把班级中的代表性人物画卷展开，把不同性格和状态的学生对高考的理解以及面对高考的反应展现出来。。赵峰和苗义这两个性格各异的普通朋友，也在高三这个特殊时期的相处中，更加了解对方，尊重对方。苗义和孙雅欣这两各对彼此有朦胧好感的朋友，互勉互助，保持合适的距离，昂首迎接高考挑战。 学习成长的过程不会一帆风顺，总会有内在的问题和外在的干扰。三位主人公尽一切可能，排除杂念，专心治学。 　　但高考毕竟是高考，是一场现实的竞争，总有人会在这个环节失利 ，有人在这里实现辉煌。赵峰和苗义都考取了全国211重点工程大学。张若然由于父母离异，家庭混乱的原因，考前心态起了波动，高考失利，不能和苗义同去北京上大学。黄珏因为学习环境的变动，花了很长时间去适应省重点的节奏，反而乱了自己的步伐，高考落榜。 　　当然，人生需要不断奋斗，高考不是唯一的挑战，走过大学门，已经迎来新世界。In the previous example of electric lights, a state mode program was completed. First, the Light class is defined, which is also called Context here. Then in Light's constructor, to create instance objects for each state class, Context will hold references to these state objects in order to delegate the request to the state objects. The user's request, that is, the action of clicking button, is also implemented in Context, with the following code: