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Humans used bows and arrows for hunting activities as early as 20,000 years ago. Modern archery began in England.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.Cole told Futuristic Technology: "We often like to publish a lot of information and make all the information electronic. But you may want to ask yourself: Do I really want to provide this information?"讲述了1937年7月7日中国抗日战争全面爆发后，三个不同出身姑娘在民族存亡关头，毅然走上前线，肩负起抗日救亡的重任；在解放战争中，她们巾帼不让须眉，带领后方广大妇女筹集干粮赶做军鞋，运送粮食、和军需物资，积极支援解放前线。就算是有写作才华的年轻人也不能免俗。　　正当申彩景家境陷入困境时，意外地接到来自皇家的信函，此时她的家人才明白之前爷爷一直在吹牛同皇家有婚约一事竟然是真的。天上掉下来的这个“大馅饼”让彩景一家人欢呼雀跃，但还是高中生的彩景却严词拒绝了这门突然到来的包办婚姻。最终，身为长女的责任感和家庭的困境让她无奈接受了这门婚事。Industrial Revolution 1.0-Age of Steam: It began in Britain in the 1860s, with the invention and application of steam engine as the main symbol. Human society entered "Age of Steam". Human society changed from agricultural handicraft industry to a mode of economic development driven by industry and mechanical manufacturing.