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In fact, employees, experiences and students describe a role, for example, a person who is a "manager" must be an "employee". In the above design, a person cannot have multiple roles at the same time, and if he is an "employee", he can no longer be a "student". This is obviously unreasonable, because many on-the-job graduate students, even employees, are students.1921年的广州西关南珠里，是梁锦坤等四个少年的天堂，看似和睦的家庭和邻里关系中隐含着巨大的危机，但这并不为少年人查知，他们一味沉湎于青春的恣意快乐和无端忧郁中。在她的丈夫李遭謀殺之後，莎拉才開始瞭解到她根本不清楚李的過去。莎拉開始去思考，李到底是什麼樣的人？他在具影響力的全球組織裡擔任什麼職務？以及，為什麼像李這樣的業務員需要佩槍？影片讲述了在美国一所普通中学发生的一场恶性枪击案的过程以及前几个小时的事情。约翰逃课未果，被父亲逼着回到学校上学；艾利亚喜欢摄影，在校园内外拍一些人物和风景照片回到学校自己洗印，米雪儿受人冷落，心情低落，到校图书馆帮助做工；乔丹刚刚交了一个新女朋友凯丽，被尼科尔等女孩子议论纷纷；而此时的埃里克和阿莱克斯由于经常受到别人欺负，无意间通过互联网买到了枪，他俩在家里午睡之后，决定到校园里大开杀戒，他们经过简单策划之后，身穿美军野战装走进了教学楼，孩子们的命运被改变了，惨剧在这个阴云密布的下午发生了。2. The coupling between the publisher and the subscriber is reduced. The publisher only publishes a message, and it does not care how the message is used by the subscriber. At the same time, the subscriber only monitors the event name of the publisher. As long as the event name of the publisher remains unchanged, it does not care how the publisher changes. Similarly, the seller (publisher) only needs to tell the subscriber (buyer) about the arrival of shoes, regardless of whether the buyer buys or not, or whether he buys other sellers. As long as the shoes arrive, the subscriber can be notified.Hunan Province天庭之上，玉帝亲督护天大将军比武。天将傲洪阴招胜雷神，雷神愤怒之下大闹天宫，被玉帝贬下凡间冰封雷泽湖千年。