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Press Ctrl + Alt + A (on the Mac + Option + A)Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:戚将军可不知道，杨参议可是下了大功夫的。再外侧，则是几乎全部聚拢过来看热闹的东番民众。It may be possible that when there is one head shot, the others will all calculate the head shot injury, but it is too much to look at the face.摩托车手KC比赛时总是小心翼翼，而与他同为赛车手的弟弟瑞普却是个天才，敢于尝试各种危险的技巧。兄弟两人一直联手参加超级车赛，相互鼓励，不断在世界级的摩托车超级比赛中取得胜利。KC赛车的费用都有赞助商提供，而这比赞助却导致兄弟之间的矛盾，为此，他们被迫走上了不同的生活道路——瑞普离开了KC，成了一个没有赞助的私人赛手，两人因此成了竞争对手。不久，KC的赞助商破产，而瑞普的赛车事业也受到威胁，与此同时，他们的父亲离奇死亡了。这时，两人才意识到必须把两人的矛盾仍在一边，共同为即将到来的拉斯维加斯摩托车越野锦标赛作准备，使KC战胜世界上最棒的赛车手，并寻找父亲死亡的真相……赵子儿和管夫人清楚地感受到汉王汹涌的攻势之后，是许多的不快和发泄。