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If you need to undo it, you can use memos to implement it and restore it to the previous state.The intermediary mode is also used to reduce the coupling between classes, because if there is a dependency relationship between classes, it is not conducive to the expansion and maintenance of functions, because as long as one object is modified, other related objects have to be modified. If you use the mediator mode, you just need to care about the relationship with the Mediator class, the relationship between specific classes and the scheduling to the Mediator, which is a bit like the spring container. Let's look at the picture first:转身就往前走。仇弟成功盗取胶卷，却也招来敌人的疯狂报复。郭天明被绑架，组织查出胶卷拍摄的是日本细菌实验的数据，日方却以郭天明作为交换胶卷的筹码。面对两难境地，仇弟勇闯虎穴，给敌人沉重打击。同时张良心中也暗暗心惊，越国到底有什么能耐，竟能这样飞快地传递消息。The modified status is: niu　　其中我们最着重想表达的是超能人应该怎样回到过去的生活当中, 他们是应该继续隐瞒自己的能力, 还是应该将自己的能力公之于众.