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3. Spaces or Enter to confirm the selected object郑氏心中一松，便笑道：也好。谁都羡慕的生活，富裕的恋人。没有什么不满。　怪咖们联手策划校园音乐剧，准备度过疯狂的一学年，但严厉的新校长却禁止音乐剧的上演，现在得靠朱莉娅流转局面张小兄弟心思实在缜密。Click on the green box of "Manaka" (the one-day ticket in the above picture is now updated to the 24-hour subway ticket, see the following subway ticket introduction for details)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.