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什么叫做高.潮到停不下。李东旭饰演韩国最顶尖line tour旅行社社长的独生子智旭，并与财团的女儿世景订婚，是一个让人羡慕的完美男人。智旭有着傲人的外貌，数不清的财富以及父亲一手创办的大企业，但是他却觉得这一切了无生趣。他小时候因拼命工作的父亲受到很大的伤害，所以从不打开心门。但是，当他认识了在line tour工作10年却要离开的女社员李妍在后，生活发生了180度变化。讲述了1937年7月7日中国抗日战争全面爆发后，三个不同出身姑娘在民族存亡关头，毅然走上前线，肩负起抗日救亡的重任；在解放战争中，她们巾帼不让须眉，带领后方广大妇女筹集干粮赶做军鞋，运送粮食、和军需物资，积极支援解放前线。大门关上，彻底结束。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.