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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.早在远古，人类曾与人类以外的种族，也就是所谓的妖怪之间，发生过多年战乱。人类取胜后，妖族们答应不再使用特殊能力，彻底服从统一管理。于是，人类与他们共同成立了一个组织，并修订了一份详细的资料集。这个组织称为山河图，而那份资料集就是著名的《山海经》。贝蒂戴维斯（苏珊·萨兰登 Susan Sarandon 饰）和琼克劳馥（杰西卡·兰格 Jessica Lange 饰）都是曾以她们耀耀生辉的星光照亮过影史的女演员们，两人事业和感情上的冲突造成了她们彼此之间深深的矛盾，这段复杂纠葛的恩怨情仇在好莱坞早就不是什么秘密了。而一个书生当时正站在这护卫身边，证明他没动过。17周菡见郑氏要张口，忙抢先应道：奶奶，孙媳妇记住了。