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故事发生在北宋中期，奸商苏光平（李建义 饰）在利益的趋势之下决定同傲龙堡主人石无忌（戚迹 饰）联姻，石无忌挑选了身份卑微的庶出女子苏幻儿（赵丽颖 饰），然而苏幻儿的个性桀骜不驯，竟然斗胆逃婚，无奈之下，样貌和苏幻儿极为相似的杨意柳（赵丽颖 饰）代替苏幻儿嫁进了石家。在石家，杨意柳吃尽了苦头，受尽了折磨，然而，坚强善良的她并没有就此自暴自弃，而是靠着自己的努力，不断的感化着周围的人们。一场意外中，杨意柳救了四小姐石无暇（郑茜 饰），之后，又凭借着自己的聪明才智，化解了家庭内部的诸多矛盾，随着时间的推移，杨意柳和石无忌之间渐渐产生了真挚的夫妻之情，可是，就在此时，石无忌的知己马仙梅（杨梓墨 饰）出现在了两人面前，要求一个名分。90年代初期，一批自称“东北虎”、“西北狼”的不法分子，打着“南下支队”的旗号，在我国绵和的铁路客运线上行凶作恶。这批凶残狡猾的车匪路霸，作案突发性极强，借助现代化交通工具，逃离现场快，危害极大。其头目二盖子（高发饰），绰号“东北虎”，不仅心狠手辣，更善于化妆各种人物，属于高智商犯罪。歹徒的猖狂，引起我公安部、铁道部公安局的极大重视。为了维护共和国法律的尊严、保护广大旅客的生命财产安全，由铁道部公安局副局长李威（陈剑飞饰）亲自挂帅，率领铁路公安系统其余四位“五虎上将”—神枪手“枪神”、擅玩飞刀的“刀子”、防爆专家“闷雷”、公安散打女冠军“刺梅”，组成“铁鹰刑警队”，而领导对其成员唯一的要求，就是“不能挂彩、伤残，谁挂彩，谁离队”。铁鹰已经张开翅膀……Three handshakes.抄家是机会？这可是闻所未闻的事。陈平站在一边，看到范增的眼神，若有所思。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.