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　　物欲横流的时代，人们该如何面对曾经弥足珍贵的亲情、友情与爱情……The function of the intermediary mode is to remove the coupling relationship between objects. After adding an intermediary object, all related objects communicate through the intermediary object instead of referencing each other. Therefore, when an object sends a change, only the intermediary object needs to be notified. Intermediaries loosely couple objects and can independently change their interaction.陈奎既然能送信给安桐，可见他们是有联系的，有把握安桐会相信。"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:这部动画描绘了这群青少年逃离学生生活，进入现实社会的生活场景，从可怕的老板到丑陋的制服，购物中心给主角们提供了一个理想的场所，在这里他们将会面临各种考验，主人公们挣着最低的工资，却为观众带来最大的欢乐。However, we know that iptables defines four "tables" for us. When they are in the same "chain", the priority of execution is as follows.3: LOGO embroidered a circle larger than the real one.