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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.节目中MC徐章煇和李寿根用神通广大的方案解决国民们的烦心事，两位综艺人分别变身为仙女菩萨和童子，展现令人震惊的外貌，吸引行人们的注意。两人对于恋爱、前途、就业等人生中长期搁置的烦恼和根深蒂固的冲突，用不做作的直率口才提出充满才智的解决方案。 特别是扫描对方烦恼时降临的艺能神投入意外的笑容炸弹，不仅是接神现场也将为电视前的观众放声大笑。桓楚的任务就是防备越国，甚至是做好进攻越国的准备。收下吧。青春文学也几乎是郭寒一人开辟的。两个护卫便抓住玉米，不让他上前。Factory method pattern refers to defining a factory interface that creates an object. Its subclasses determine the classes to instantiate and postpone the actual creation to the subclasses. It emphasizes the change of "single object". The main points of its implementation include: