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WillScott是领先的密码分析专家之一，他雇佣了一份严重的密码文件。他发现了一张名单，把他的头发放在背上的坏蛋身上。上世纪九十年代，北京什刹海边槐树胡同一个普通的小四合院，住着老牛一家三代，老两口牛德山和周二玲，大儿子牛建国和儿媳金梦瑶，二儿子牛建军、儿媳杨雨彤和小孙子牛中天，还有小女儿牛建红。这一家人历经了风风雨雨、磕磕绊绊，聚散离合之后，还是那一份浓的化不开的牵挂，将全家人紧紧地聚合在一起。大儿子牛建国是名汽车装配工人，为人忠厚坦荡，是个孝敬父母、关心弟妹，疼爱老婆的好男人。牛建国和曲艺演员金梦瑶结婚几年也未能有个一儿半女，这不仅成了他的心头大患，也是老牛家的一大遗憾。为了能怀孕，尝尽了各种办法，婆婆周二玲还不惜花大价钱买偏方给儿媳治病，结果还是没有动静。金梦瑶还怀疑婆婆的药是否可靠，使得本来就紧张的婆媳关系进一步僵化。CJ1, …胡钧沉默了一下。Account Name: Jiangsu E-Commerce Service Center Co., Ltd., Opening Bank: Hanzhong Road Sub-branch of Nanjing Branch of Huaxia Bank, Account Number: 4140200001819100012220Now, 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./work