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Powerful document management(2) Take a turn towards the ship that is right or right behind it.多少啊。菲利普与玛丽萝两人迈入老年，即将规划他们梦寐以求的退休生活：搬往葡萄牙，充满阳光的地中海旁生活！当他们以为终于能平静享受人生时，他们的女儿却另有规划…。臣谢越王。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.Around these problems, Rui Yi interviewed the founders of some children's thinking ability training institutions, parents who have invested capital in this field and have let their children receive thinking ability training.