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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.方家兄弟和葫芦等人赶过来，见他衣衫下摆被血迹染红，均吓了一跳。唐僧（谢霆锋饰）在取经的路上千辛万苦，他们来到了莎车城，在热烈的欢迎仪式上遭到了树妖的偷袭，把他的徒弟都抓走，剩下了唐僧一人。在这个镇上，唐僧遇到了一只样子丑陋但性格活泼的蜥蜴妖美艳（蔡卓妍饰），美艳对唐僧一见钟情，唐僧被美艳的性情感动，两人都严重违反了天规。唐僧发现美艳藏起了一个天外来客（范冰冰饰），美艳更与这位美丽的天外来客成了情敌。 　　原来美艳并不是一只妖精，而同样也是一名天外来客。美艳不顾安全救回了唐僧的徒弟，愿意接受天庭的审问，唐僧为了救回可怜的美艳，竟拿起了大刀……　　在那里，他们遇到了一位自称为普鲁修卡的女孩子……片刻，他感觉活力流过了五脏六腑，浑身阳气大盛。