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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.　　该片故事讲述萨曼莎(瓦伦蒂娜·贝莱饰)在上学途中被一只巨型兔子绑架。15年后，在医院的她很震惊她还活着。格林博士在她身旁，试图帮助她回忆。在萨曼莎的回忆中，她被困在一个地下监狱，在那里有人强迫她玩游戏、解谜语和谜题，还有奖罚机制。同时一位命不久矣的天才前调查员也在调查这桩神秘事件。/v fire可以先将粮草运送到荥阳，根据情况来调运。Treatment method为怕大人悬心，也没敢告诉方夫人，只等回去再说。从此后，他可就倒霉了，每天要煮饭不说，又多了洗衣的活计。