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神奇校巴的孩子们冲向轨道，进入国际空间站，却发现他们需要逃离一只巨型缓步动物！伊戈尔继续在警察局工作，每天侦破新案件的同时继续寻找杀母凶手。然而，强大的敌人使他很难兼顾守法与复仇。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.卢绾沉声道：人是活的，他们昨日在江陵，今日就不能在夜郎吗？副将这才清楚地发现卢绾没有和他开玩笑，脸上的表情顿时有些不自然了，迟疑片刻才愕然道：将军，你是说越国人会从夜郎那边进攻？卢绾轻轻点点头：是的。