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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:故事讲述的是在公元前800年，来自全球不同地域的羊羊们纷纷云集青青草原，来参加第125届)羊族奥运会。赛场上聚集了各个部族的羊羊们，有盘羊、机械羊、黑山羊、山羊、绵羊、藏羚羊等等，十分热闹。而狡猾的灰太狼自然不会放过这个千载难逢的好机会，他混进羊运会，想出各种办法去抓肥羊吃。于是，一场羊和狼之间斗智斗勇的比赛又开始了。 　　What is the difference between deliberate practice and our usual practice?尹旭心里明镜似的，刘邦有意无意的挑拨，很可能是想自己从项羽一边倒向他。假面骑士诞生45周年纪念作品。共七集。Three teams play round robin matches. According to the points, the one with more points is the champion!