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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.Zhang Xiaobo blinked after saying these words, After a pause and a sigh, Like every veteran interviewed, these are memories they don't want to mention again. His expression told me more that he must have remembered something more that made him feel heavy-hearted. I saw the details of his facial changes after writing the interview information just collected, and asked:故事开始在centerperk咖啡馆里，婚礼上落荒而逃的瑞秋闯进来寻找老同学莫妮卡。莫妮卡的哥哥刚刚离婚，而他从小暗恋的人正是这个落跑新娘瑞秋。瑞秋在莫妮卡家住了下来，决定不在做爸爸的女孩儿，真正的步入社会，于是在其他老友的帮助下，她上路了，从二十多岁初入社会，到三十多岁成家立业，他们一走就是十年。十年间风风雨雨，在嬉笑怒骂中，在离别团聚中，他们向我们讲述着友情、爱情还有生活。让我们和他们一起开怀大笑或是黯然神伤。然而，要是我这一生再不能见到赵姑娘，我是宁可死了的好。B.JS is responsible for monitoring the add message and displaying the total number of clicks on the page. The following code:若命都没了，还求什么亲？拿什么求……秦霖眼神一凝，注视着紫茄道：姑娘此话当真？紫茄见高凡只跟他说了几句话，他便神采灿然，精神迥然一变。-Some problems with opening the mirror file after loading;