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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:郑氏再也不能置之不理，心虚地解释道：这娃儿太皮了。5-second rule: After holding the ball, the player must throw the foul ball within 5 seconds, and FIBA rule stipulates that the free throw must also be shot within 5 seconds. 　　「TVB」旗下OTT平台myTVSUPER刚踏入五周年，特别推出全新节目，由邵氏兄弟出品的《「鬼上你架车」》，并于5月7日于myTVGold正式上架。一连十三集的《鬼上你架车》可能是电视史上最恐怖，需要签家长回条才可收看的节目，由「方力申」及当奴担任节目主持，每集邀请不同艺人在车上分享最恐怖、最诡异的灵异故事。等看完这篇文章，大家都脸色不好看了。