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　　令《圆圆的故事》情节更加有趣！不过和16年前相比，剧中每个角色都有了不小的变化：妈妈和平已经成了一位著名的大鼓演员，爸爸贾志国也当上了副局长，俩人住上了郊区的“Town House”豪宅，沈畅扮演的小张阿姨在幸福里社区开了一家茶餐厅。人总是等到失去后才知道珍惜，如果可以从头来过，是否就可以弥补缺憾，达成心愿？颇多心计，还满口脏话。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.Li Shanglong, a young writer, told a story: When he first went to college, a classmate in the dormitory was very stingy. On one occasion, Li Shanglong's cell phone ran out of electricity, so he asked this classmate to borrow his phone and call home. After the call, Li Shanglong returned the phone to him and turned out of the dormitory.他从来都是好汉不吃眼前亏，晓得哥哥们的威严不容冒犯，及时低头，然后再总结经验教训。