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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.小二更是两眼放光，崇拜地看着赵锋。也不见他狂妄自大，也不见他清高自诩，当然更不会对这些人刻意拉拢，或谈风俗，或言民情。医院楼顶平台，身患癌症的工程师赵志平纵身跳下……没想这自私的一跳非但没有解脱，反倒让妻子叶子和主治医师顾汉梁同时陷入绝境。他们一个是热爱生活、阳光乐观的幼儿教师，刚刚背着婆婆拆兑好医疗费尚未喘息却再次面临危在旦夕的丈夫；一个是自命不凡、高傲冷峻的海归博士，为救人决然放弃国际医学大会却被竞争对手洪峰占据大外科主任的制高点。谁料一波未平一波又起，叶子的表妹、报社记者董芊芊紧抓“患者自杀”一事不放，并将顾汉梁的言论独家曝光。面对眼中钉深陷官司门，洪峰一边趁机挑唆原本就捉肩见肘的赵家状告医院获得巨额赔偿，一边鼓动邝院长让顾汉梁登报道歉平息医患纠纷，这让本来就很紧张的医患关系陷入僵局。眼看双方就要对簿公堂，死里逃生的赵志平凭良心说出事情，叶子暗自欣慰，顾汉梁则大跌眼镜。两个看似永远都不会有交集的人就这样卷入彼此的生活。赵光头一声吆喝骂道，没有徐先生，咱们破得了杭州？可……船主拿主意。王舒望和陆露在泰国相遇相识，经历了一系列惊心动魄的事情之后，相爱了。回国后，两人准备结婚，却遭到了双方家庭的反对。王舒望放弃了北京的事业，来到上海，开了一家陶瓷店，向陆露的家人证明自己可以给陆露更好的生活。陆露的父母依旧认为王舒望和陆露不合适，不同意他们的婚事。王舒望的异父异母姐姐赵燕也多次来到上海，还和陆露的妈妈蒋妙音发生了争吵。这让两人的婚事再度拖延。陆露和王舒望的爱情不断经受着来自双方家庭的打击和考验。