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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.新猴王传奇第二季……众人禁不住大笑。故事发生在三十年代的香港，贪官污吏横行，拐卖案件频发。某日，梁芯（杨怡 饰）前往警局报案，遇见了名为金华（张继聪 饰）的杂差，梁芯深知警局内见钱眼开的歪风邪气，自然没有将破案的指望托付在金华身上。之后，梁芯遇见了警察沉一然（杨明 饰），和其他警探不同，沉一然年轻有为正直勇敢，在他的帮助下，人贩最终落入法网。电视剧《一个人战争》讲诉了发生在真实和残酷的抗战背景下，在紧凑的8天内一小队特殊组合的人群的抗战故事。Iterator patterns are created for collection objects, For collection objects, It must involve the addition and deletion of collection elements, and certainly supports the operation of traversing collection elements. If the traversal operation is also placed in the collection object at this time, the collection object will bear too many responsibilities. At this time, the responsibilities can be separated and the traversal of the collection can be placed in another object, which is the iterator object.汉王刘邦站在原地，远远瞧见韩信走过来，立即兴奋道：韩信啊，过些过来。