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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."I think so, But it was too late, I'm sitting here and I'm telling you, It is said in a straight-forward way, But when this happened, Basically between crackles, The company commander's military quality is so strong, Also see in the eye can't help, He saw that the three men could not be saved, I think he is also in a hurry, From behind, he grabbed a three-piece explosive cartridge, Unscrewed the back cover, pulled the lead and held it on his shoulder, just like the javelin thrower in the Olympics. He threw the cartridge sideways, He threw such a heavy thing so far away, It's almost farther than I threw a grenade, Because I don't know how many times the front of the position has been ploughed by artillery, Full of floating soil, It's very soft, So when the explosive cylinder landed, it was finally inserted obliquely on the ground. It was also impartially inserted in the most densely populated position of the group of strange dogs, Then the explosive barrel exploded, which was quite powerful. I felt that it was more powerful than a shell. The width of the whole position was completely covered by 10 meters in front of it. On the spot, the strange dogs that were still biting the body and rushing halfway were all killed. My military cap was blown off by the shock wave. "Wang Zeduan said.杨长帆揉着眼睛非常无辜。2. Pay the signature business handling expenses to Jiangxi Jinge Company's account (please remit money from the Company's account, Jinge does not accept personal account remittance):《拜托啦师兄》以鲜有影视作品涉足的击剑领域切入到运动题材，在剧情上融合激动人心的竞技体育、百转千回的情感纠葛和跌宕起伏的人物成长。该剧主要讲述的是一个天才击剑少年遭遇重创之后，在体育精神的引导下，涅槃重生，再创辉煌的故事。通过一群击剑运动员的心路历程，投射出年轻一代百折不挠、热血励志的奋斗群像。[Extension] Wuxi Enterprise's First Certificate: Free; One household with multiple certificates/foreign enterprise certificates: 150 yuan/sheet/yearWhat is the real demand of parents for the cultivation of their children's thinking ability at this stage?