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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:Norton AntiVirus/Norton Internet Security (later than 2012, up to version 22.6. X.x)昨天晚上参与作战的可是整整的两三万骑兵，那种万马奔腾，肆意驰骋，奋力砍杀的感觉相当的刺激，可是让尹旭大开眼界。因看见旁边有人吃馄饨，碗里还漂着几根绿色的菜叶，大为诧异，忙问道：请问婶子，那是什么青菜？大婶顺着她的目光一看，就笑道：不是青菜。家常菜是家庭日常制作食用的菜肴,家常菜，是中菜的源头，也是地方风味菜系的组成基础；家庭利用现有的调味品也可以炒制出的菜肴。家常菜反映了上世纪七十年代末的一群人的平凡生活。该剧用对小人物生活细节的刻画，以及柴米油盐的百姓生活为主调，用温情又充满波折的故事剧情吸引观众视线，令人感到亲切和共鸣。随着板栗下塘，池塘里就哄闹起来。