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Elena一直是当地学校的“学生之星”—她靓丽，受欢迎，能融入校园生活和朋友们打成一片，但是这个新学期她却不得不在人前人后极力掩饰失去父母后的伤痛。新学期的校园似乎与往常没有多大区别，但转校生Stefan Salvatore的到来打破了这一切，Elena和她的朋友们都情不自禁为这个异常帅气却处处透着神秘的新生所倾倒。似乎冥冥之中受到某种牵引，初次见面的Stefan和Elena就深深地被彼此吸引，然而Elena却绝对不会想到眼前这位英俊迷人的年轻小伙会是一个活了几个世纪的吸血鬼。Compared with online institutions, first of all, customers have stronger trust in physical institutions; Secondly, offline organizations have a strong scene, making it relatively easier to manage teachers and supervise students' learning. In addition, the teacher-student interaction and student-student interaction in offline institutions are more direct and social. However, due to its strong regionality, its customers are more direct and accurate.时值深冬，冷风呼啸而过，在马路旁的一间新式面店内，一对男女，谦和小月分手了，没有呼天抢地的哭声，也没有你死我活的对骂声，就只是这样，平淡和平得像没事发生过一样结束了这段只维持了一年半的爱情！整容医生文琪因自己医治病人的病例档案意外泄露于互联网,而被医院、媒体、患者各方追讨责罚,其中一患者又离奇身亡,令文琪工作和生活陷入巨大的困境之中。整容机构老板美凤在文琪危难之时伸出援手，为其摆平医患纠纷；同时将文琪招至麾下,还付以重金支持文琪的“美丽计划。美凤不仅给了文琪新的工作,还将自己的弟弟大伟介绍给文琪。为还自己的清白和患者之冤，文琪暗中调查事件,当真相渐渐破茧而识时，文琪不得不重新来判定美凤对自己示好的真正原因,原来美凤要得到文琪的科研成果，而且要隐瞒自己多年以来犯下的错误。最终，居心不良者遭惩罚，文琪走出困境,收获了幸福。青山一声不响地去报了名。Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.