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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.References and annotations********葫芦听着微风吹动竹叶飒飒轻响，想着板栗就要回来了，禁不住心怀舒畅，便道：好，我来吹一曲。经济学女博士王敏与在彝家山寨谷莫村担任扶贫第一书记的未婚夫周林商定，在谷莫村脱贫后完婚。工作中周林受伤，王敏申请接替周林到谷莫村担任第一书记。王敏自信满满，认为一年之内让谷莫村脱贫不成问题，但谷莫村严峻的现实给了她当头一棒：村里基层组织涣散，因为建卡户问题矛盾重重，村里的旧势力巫萨和公认的能人木呷都和她处处为难，作为城里姑娘的王敏在彝族山村显得格格不入。同时，谷莫村的贫困现状和村民的淳朴善良也深深触动了王敏，她开始正视脱贫攻坚这项艰巨的工作。她调查研究，公平地解决了周林遗留的建卡户问题，赢得了人心。周林因建卡户问题受到处分，情绪低落。在王敏的影响和鼓励下，周林决定申请到最艰苦的“悬崖村”格古村担任第一书记。王敏说服木呷回到村里做致富带头人，带着村民们修路，通网，搞旅游，种彝药，谷莫村每天都发生着令人惊喜的变化。Most P2P is unable to pay now, which is actually due to the panic and chain reaction brought to the entire industry by the continuous thunder explosions.　　不料黄专务却信以为真，将江图视为眼中钉，分派至开发部，与一群公司不想要又没正当理由裁掉的一群人一起工作。而海媛因江图对茱莉的请求，才重新获得机会顺利进入公司，也因此被茱莉怀疑其和江图的关系。出演《笑傲江湖》女主角的人必须是启明文娱的。