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古往今来，皆是如此。小葱就对随赵清进来的一个小女娃——叫九儿的，约莫七八岁，是医学院的学生——低声说了几句，她便抿嘴一笑，转身跑出去了。The key difference lies in how deeply we understand a dynamic system so as to establish an optimized control process. What is the optimization process (repetition and monitoring) that enables the system to achieve a high level of control performance?板栗知必有缘故，也不问。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.这时，小葱带着玉米和大苞谷匆匆来到刑部公堂。