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The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:说话没谱办事不牢的MIKKO，装酷成性的大情圣俞白眉，加上流氓假仗义的宁财神，北京人上海人哈尔滨人，三大著名网虫会北京，一个屋檐下，熬成一锅味道鲜浓古怪的八宝喜剧粥。123. X.X.81老丁叹道，将军提前交代过我，要尽力帮他，如若换了别人，同样置办这些东西，要出三四倍的价钱怕都不止。没有犹豫，爱本来就不需要犹豫，没有同生共死的勇气，你凭什么去爱？这时，青云门掌门手持诛仙剑，站在半空，犹如神祇俯视众生，最后目光停留在张小凡身上。From the moment the activity entered the final preparation, I deeply felt the strength of unity. We work together to prepare lessons, we rehearse carefully, and we encourage discussions. All this is "we", not "I". This is what team cohesion and team spirit should be like. There are always many challenges and difficulties for the 18 players to deal with strange people in strange places. However, when the wisdom of the 18 players is integrated, any problem can be solved. Unity and mutual assistance, difficult challenges, this is the main theme of this activity.The group of the dead.