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柳记粮店老板的儿子柳云轩，抢了家里的钱做经费，去省城参加学生运动，被赵督军抓捕。刑场上，柳镇土豪柳爷的大太太救下了柳云轩，赵督军却趁机吞吃了柳爷买枪械的五千大洋。柳爷损失了巨款，要拿柳家的人命相抵，柳云轩无奈去了柳家大院做家丁。 　　Today's social environmental problems are becoming more and more serious, and the awareness of environmental protection is gradually fading in people's minds. In addition to the destruction of our actual actions, the environmental problems of the whole earth cannot be ignored. If we love our earth and our home, let us give a little strength to smile. Therefore, we designed this activity.香荽从后院出来，张开双臂飞扑向张老太太，娇嫩的嗓音腻死人：奶奶。Questioner: NightLet 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: