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When making exposure compensation, if the photo is too dark, the exposure value should be increased. Every 1.0 increase in the exposure value is equivalent to doubling the amount of light ingested. If the photo is too bright, the exposure value should be reduced. Every 1.0 decrease in the exposure value is equivalent to doubling the amount of light ingested.Define two implementation classes respectively: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.藤第一中学，男子足球部——。大帐里静的落针可闻，谁也没想到宋义突然变的这么强硬。　　“大话王”赵德兴（郭晋安饰）因一次意外令生意搭档蒙一言（谭俊彦饰）头部受伤并失忆，赵德兴要在24小时里帮助蒙一言找回记忆，以此为主线串联起种种社会荒诞现象和人物。父子二人落寞地走到人群前。