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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.葫芦气坏了，问闺女道：到底是谁让跪的？几个声音一齐抢答：是七叔（七舅舅、七表叔）。可是时过境迁，竟然落得如此下场的，当真是让人唏嘘不已。　　《三哭殿》这部影片的摄制宗旨是尊重传统、传承传统，在尽可能保留原汁原味的前提下发展创新。因此，该剧版本虽多，但电影剧本以当年唐喜成先生演出本为基础，仅作了些电影时空的处理与调整。在唱腔方面，尽可能小改小动。为了保证这一意图的体现，我们特请当年该剧舞台导演、秦英的扮演者谢巧官出山担任副导演。与此同时，又将影片全部场景放在横店影视城的实景拍摄，在戏曲与电影两种不同的艺术形式之间，以戏曲为本，避实就虚、虚实结合，通过真实的皇宫庭院，丰富了影片的造型元素，给人以赏心悦目之感。Editor's Note: This article is transferred from WeChat's public number "KMCenter for Knowledge Management" (KMCenter). The author is Tian Zhigang, a well-known knowledge management expert, who is the author of "Your Knowledge Needs Management". The content of this article is the material of "How to Become an Expert". 36 Krypton is authorize to forward.电影讲述了退休军官老丁(洪金宝饰)因“健忘症”弄丢孙女，内疚回到老家。邻居小女孩春花(陈沛妍 饰)成为他的慰藉。可女孩的父亲(刘德华饰)无意卷入了当地黑帮团伙的争斗中。老丁为营救春花挺身而出，也寻回那份作为军人的骄傲和弥补作为爷爷的过错。