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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.杰克和莎莉一晚到盖伯和非迪夫妇家中，两人一脸镇定的宣布他们要分居。后来杰克爱上美貌的年轻女郎，非迪介绍单身同事麦可给莎莉，不料盖伯对班上才情出众的女学生动了心。经过一阵紊乱后，杰克和莎莉和好了，盖伯和非迪却分手了。周芷若千娇百媚，婀娜多姿，眼眸中、身体上都散发着一股媚态，简直标准一个狐狸精模板。Princess Pingyang and Emperor Wu of the Han Dynasty met Li Yannian while listening to the court band playing music. Princess Pingyang proposed to marry Li Yannian's sister to Emperor Wu of the Han Dynasty as a concubine on the spot. After marrying Li Yannian's sister, Emperor Wu of the Han Dynasty doted on her. However, Li Furen died of illness soon after, but Emperor Wu of the Han Dynasty still could not forget her for a long time. (Lecture Room 20160304 Poetry Love 1 Beauty Difficult to Get Again)什么是天堂?天堂有多远? 孩子生命老公家人朋友 我们到底还有多少时间 人们的时间，总是那么短又那么长 那微笑吧！我们说好不哭 孙又翔(修杰楷 饰)与赵承舒(林予晞 饰)与母亲及女儿如曦一家四口幸福的生活，承舒在怀第二胎的同时得知自己罹患脑癌第四期的噩耗！ 看着为家庭努力付出的又翔，和还未长大的如曦，感受肚中的小生命，每天努力的长大。而她却必须在生命与孩子之间，做出选择……发生杂肥猫与三小强身上的的有趣搞笑的故事/beckon (recruit)