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.
瞿秋白和杨之华的爱情之旅是在上海大学开始的。瞿秋白是社会学系主任，而杨之华则是他的学生，杨之华是从家乡来到上海寻求民主救国的新女性，老师的才华和风度深深打动了杨之华，更让她羡慕的是瞿秋白与妻子王剑虹的举案齐眉，因为人生理想的差异，她对丈夫沈剑龙感到有些失望。于是，她把全部的热情和大量的精力投入到学习和革命中，最终成为了中国共产党一员。
猫吃了舍利后成猫妖，并爱上了前来讨伐她的神仙。
Four, about erasers and softening, hidden sideline
(Update on January 1, 2018)
先是低笑，接着是大笑，最后笑得前仰后合。
阿郎（周润发饰）年轻时作为出色的赛车手很是放荡不羁，却不妨碍富家女波波（张艾嘉饰）对其一往情深，波波不顾家人反对同他结婚并怀下身孕后，发现阿郎背着她还有其它女人，愤然离去。波波临盆之际，阿郎参加非法赛车撞死警察入狱，波波也因被母亲和医生告知婴儿夭折去了美国。出狱后，阿郎很为以前行为愧疚，从孤儿院找回儿子取名波仔（黄坤玄饰），父子二人开始相依为命过日子。十年后，已有未婚夫的波波回港又遇阿郎，得知波仔是自己的儿子后想将其带去美国，内心仍深爱波波的阿郎为了证明自己已有彻底改变，决定不顾年纪和身体状况再战赛场。
Public class User2 extensions User {
My reply was very peaceful, and I also gave some friendly suggestions to beginners, and 6 people supported me. Just think about it. However, today, I saw this "Daniel" calling me a spurt in my blog post on the front page:
纳净云从警官大学研究生毕业，分配到东环市公安局。在回来的火车上他三拳两脚打跑了调戏姑娘的几个流氓，并因此结识了漂亮的女记者王彤。纳净云自己要求去重案组做了一名普通刑警。他认为六年寒窗，完全可以凭借丰富的理论知识在刑侦战线大显身手，一鸣惊人。没想到已有四十年警龄的探长王贵金安排重案组女侦察员周菁芳做纳净云的搭档……
流萤（祝绪丹 饰）是夏侯雪身边的小丫鬟，无意间遇到了一条蛇吓得差一点魂飞魄散，流萤连忙将蛇抓住，殊不知这条蛇就是一条修炼千年的应龙，名叫尉迟龙炎（王鹤棣 饰）。尉迟龙炎为报恩带流萤离开，结果阴差阳错之下让关心流萤的夏侯雪误以为失踪，寻 找途中遭遇狼妖，最后意外死在尉迟龙炎手里。尉迟龙炎满足了流萤的心愿，救回小姐并守护她三世。就这样尉迟龙炎一面履行着承诺，私下里却一直保护着流萤的一世又一世，直到第四世顾轻烟，才知道尉迟龙炎的存在，为救被天条惩戒的尉迟龙炎被命格星君吸收了灵魂，最后另一半灵魂和尉迟龙炎融合，助尉迟龙炎打败了反派。
The printed board must be marked every time it is revised. Add a "*" after the version number for each revision.
月下也要写出十亿字。
悠悠和美嘉从校园拍卖会上淘回了不少好东西，而子乔则买到了与学生妹一同补习的约会时间，张伟对此羡慕不已，却不曾想被忽悠买下了一台闲置的旧冰箱。就在大家嘲笑张伟的时候，冰箱里钻出了四只外来星球生物，这四只生物将带领爱情公寓四位主演穿越到各个不同的地方，甚至外星，去寻找神秘的原力…不可思议的故事就这样在熟悉的爱情公寓里上演
选出来的必是秀外慧中。
幸与绫理是对新手姐妹，两人的互动在持续共同生活中逐渐减少了生疏感。
An untraceable group of elite bank robbers is chased by a suicidal FBI Agent who uncovers a deeper purpose behind the robbery-homicides.
齐景浩、侯建白、云高洋是腾远乒乓球社的主力队员。由于成绩不佳，球社面临取消危机。球社社长齐景浩为重振腾远球社，学习“旋风球”，并邀请昔日对手厉圣加入。在历经各种挑战后，腾远球队终于向全国学院杯冠军奖杯发起冲刺。
