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这能改变么？能也不能。Thebrain Cracked Edition is a powerful mind mapping software, which is mostly used in learning, speech, project management, meetings, demand research and analysis and other occasions. All its information is connected through one node after another, finally forming a miscellaneous but not messy network structure. Once you search and click on an idea, all relevant information related to it is clear at a glance.臭小子，那依你之见，这刘邦可信吗？英布笑骂着询问。A4.1. Visual function examination.Keep your name, keep your name and look at it slowly.《火速救兵》（英语：F.S.D.）是香港电台电视部与香港消防处联合制作的单元剧。的，是一班临危不乱的救护员。他们为痛得呼天抢地的伤者进行急救、为吓至惊魂未定的市民伸出救援之手。勇气不是上天赋予，处变不惊的能力也不是一朝一夕而来的。消防员和救护员的「周身刀、张张利」，是艰苦训练的成果。由消防处长至所有消防员，都是由训练学校这个大摇篮培育出来的。在短短的二十六周内，学员学到的岂止是救火救人的技术，还有团结合作和不分你我的无私精神。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.