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/pest (expulsion)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.5. When the scale of a ship engaged in diving operations makes it impossible to display the lights and types specified in paragraph 4 of this Article, it shall display:　　然而，天有不测风云，一场又一场的麻烦和变故，接二连三地降落在他们身上……Excellent and competent MDT meeting chairman and coordinator are very important to MDT meeting.　　本剧讲述了主人公屌丝杀手小黑接到任务去暗杀女主小泽，却不成想碰到了已经被别人杀害的小泽的好友小优，伤心的女主与愤怒的姐妹们以为是小黑受人指使本要杀害小泽却才误杀了小优，威逼利诱下，小黑供出了表面上一直喜欢小泽的黑帮老大埃克斯是如何诱骗自己以及指使自己，不敢相信事实真相的小泽与姐妹们明察暗访，这时正准备逃走的小黑发现女主小泽就是自己小时候一直默默深爱着的玩伴，他决定用自己的生命去保护小泽，但在小黑想方设法保护小泽的同时，他发现在这表象事实的背后还隐藏着一个更大的阴谋......