张杨听说是那黑少年先动的手，松了口气。
抗战期间，日寇成立汉奸武装，对抗日根据地进行蚕食、破坏和袭扰并暗杀我地方干部。一天，在迎亲的队伍中，化妆的日伪军杀害我方骨干队员，引起强烈民愤。为严惩汉奸暴行，一支叱咤风云的敌后便衣队从此活跃在淮北大地上，在执行反特锄奸，敌后侦察，拔除据点，内线策反，武装打击日伪土顽势力，深入敌营惩办叛徒恶霸匪首等特殊而艰巨的任务过程中，大队长陈忠华老成持重，政委贺兰刚柔相济，关涛刚烈勇猛而内心情感丰富，不同个性的新四军战士组成了一个威震敌胆的英雄群体，成为一群红色传奇人物。
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:
