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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.“小李飞刀，例无虚发”，昔年小李探花之飞刀绝技名震江湖，其嫡传弟子叶开，深得真传，挟技闯荡江湖，迅即声名鹊起。叶开受阿飞所托，一心保护心智迟钝而貌若天仙的上官小仙免受江湖中人滋扰，因江湖传闻上官小仙身藏有昔年威震武林的金钱帮一笔庞大的宝藏及上官金虹的武功秘笈，江湖中人遂起觊觎之心，叶开保护着上官小仙，就正如暴露于群鹰注视中的狐狸一样，无处可避，当叶开发觉堕入一个扑朔迷离的圈套内，处处受制于人，无法自拔，更赫然知悉发动该项阴谋的主谋竟是身边恍如白痴的上官小仙。而上官小仙在利用叶开之同时，亦深深爱上叶开，及其达成歼灭武林一些劲敌，取得一定的武林地位之余，方才发觉满以为垂手可得的爱情已失诸交臂，丁灵琳为叶开恋人，一心对叶开痴恋，虽几经上官小仙阴谋夺爱，处处陷害，仍是对叶开矢志不移，其坚贞之心也换来叶开终生不渝的爱情。叶枫并不是一名弱质女子，她走私军火，贩卖人口，国际刑警屡次逮捕，都让她神通广大的逃脱，叶枫将于十日之内在中缅边界旳加莱镇接收一批有史以来最庞大的生鸦片大买卖。First of all, the weakness of the yellow character is related to the meat quality. It cannot be generalized.　　全不知情的光头强带着女孩外出，路上遭遇警察的追捕。混乱就此开始，小女孩的命运该如何呢？凯奇是一个充满好奇心和正义感的男孩，他还有一个神秘的身份：奇趣特工队队长。他和他的伙伴们，调皮骄傲又听得懂外星语的宠物“闪电猫”、彬彬有礼、温和待人的管家“艾尔”、以及意外流落地球的外星访客“嘟嘟公主”，组成了守护小镇的奇趣特工队。在守卫小镇的过程中，奇趣特工队不仅要帮助总是“好心办坏事”的乌龙发明家青椒博士，解决暴走的发明品所带来的麻烦，还要和马戏团长“班主先生”、外星人“皮录”和“小矮妖”斗智斗勇。所幸，凯奇和伙伴们拥有的神奇徽章，能让大家变身成为奇趣特工，充分发挥各自的特长和技能，齐心协力，化解每一次的小镇危机。而奇趣特工队，也在一次次任务中不断学习，不断成长，最终成为更加出色的超级英雄。