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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.Central focus metering: It is a traditional metering method, which pays attention to about 2/3 of the position in the center of the picture. The advantage of this metering method is that it is easier to control the effect.可真正打起来呢？似乎战斗力才是最重要的。为了呈现优质的画面美感、动人心弦的剧情和演员阵容，北京东王文化公司特地组合霍建华、孙俪、姚采颖、胡宇崴双生双旦，演绎一场浪漫悲伤交杂的爱情故事，将不惜花费大成本前往英国、上海、海南等地拍摄，将雪地的英伦浪漫、上海风情演绎的美轮美奂。黄豆就对知府大人道：我爷爷他们不是去闹事的，是去找胡家的长辈理论的。　　为了还自己清白，齐淼努力查找真相，一个惊天秘密浮出水面。