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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.黄豆和黄瓜眼睁睁地看着她滑到，吓了一跳。四位使者都涨红了脸，愤愤地看着二人。围绕着什么都不怎么起眼的十四岁少女关谷鸣展开，一直憧憬着成为生活主角的她在度过的每一天里，总想着能有人把自己从现在的这个世界带走，就像是所有故事里的女主角遇到的不可思议的经历那般。而在一个月夜，她真的邂逅了一位如同妖精似的异国少女，并随她进入了名为“夜来舞”的非日常世界，由此故事开始了。一丝的纯情叙述了在江南歪曲的课外辅导热潮中，沉迷在子女教育问题的一名家庭主妇，与偶尔相遇的牙科医生堕入爱情的故事。《佛本是道》中，玉帝是三界公认，圣人之下最强，实力手段都要稳胜如来，可是玉帝所做的事，比起《西游记》中的，还要乱七八糟……，连家务事都要外人来插手。-----