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Try the home and end keys, or the page-up and down keys next to them.罗四海（谢贤 饰）是名震江湖的千王之王，一日，他偶遇了在人前自称小千王的青年雷力（汪禹 饰）。虽然雷力自称小千王冒犯了四海，但是四海见他天资聪颖，有心栽培他成长，于是允许他跟着自己一起闯荡江湖。上海大亨张烈（陈观泰 饰）赌术出众，在上海开设了赌场，这引起了当局情报机构的怀疑，怀疑他就是在此设立了日本特务组织的千霸。于是，情报人员郭胜派出手下将四海带来，亲自要求他为国立功，利用他的千术在赌桌上挑战张烈，并伺机将他消灭。一场你死我活的争斗展开了。Now go into the container to see if/data is present:1937年7月，中日战争爆发。国共两党为了民族解放大义，摒弃前嫌，同仇敌忾，共赴国难。川军青年军官李德明因为未婚妻的地下党身份，成了被缉拿的“共党嫌疑”，军籍难保。这让一心杀敌报国的他陷入绝境，忧愤交加……由于一系列的原因，独立营转战山东之后，休整练兵，原地待命。李德明求各连排一定要搞好军民关系，先后成立侦察队，并三顾茅庐请当地过去29军大刀英雄出山给川军士兵教练大刀，苦练军事本领。在孤军深入出生入死的艰难历程中，接连取得了击毙鬼子少将，舍命营救韩家寨乡亲以及和挺进山东的柴万红八路军支队并肩偷袭敌人机场的一系列胜利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.