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担心他再睡下去会着凉。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.《龙日一，你死定了》是一部校园、青春、时尚网剧。该剧主要讲述优等生张静美转校来到顶级精英学府——本承学院，却在入校第一天不幸遇到“校园魔头”龙日一。两人就在这一来一回、斗智斗勇的较量中互生情愫。他们的恋情在本承学院掀起巨大波澜，同时也让龙日一家族的关系变得微妙起来……ZThere is not much requirement, just an average promotion.将他与几个侍卫单独关押的。