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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.‘泰山不让土壤，故能成其大。In the "Columns" dialog box in the above figure, you can set the number and width of columns as needed, and set columns for the entire document or the current section.Coconut garden also tried, coconut cake is still called coconut milk jelly, fragrant glutinous smooth, good! Coconut rice and accreted duck taste good,Ignorance, impetuousness and conceit are probably the three most dangerous weaknesses in investment. However, what is more troublesome than these three items is the compound danger. For example, ignorance + conceit escalates to stupidity, ignorance + impetuousness becomes gamblers, and all three are typical "stupid gamblers". From this, we can see that continuous learning, guard against arrogance and rashness, self-knowledge and honesty are the necessary prerequisites to avoid becoming stupid gamblers.　　任务迫在眉睫，危急时刻，打入保密局内部的“鲨鱼”不得不冒死现身，目共两党展开了前所未有的情报斗争、隐蔽斗争……