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都是狗狗惹的祸是美国拍摄的一部家庭喜剧电影，主要讲述了一对年轻的夫妇带着孩子在田园般的岛屿上避暑消夏。他们遇到一个被遗弃的流浪癞狗，爸爸建议把它送到动物保护机构，但孩子请求留下这条狗。一家人达成折衷的协议：孩子可以帮助弗兰克恢复健康，但必须在夏季结束时把它送到动物保护机构。当弗兰克的身体慢慢康复，它为这个家庭带来了意想不到的事情。但它渐渐融入了这个家庭，并以其独有的方式使这个家庭更加和睦...像海水般湛蓝，这不美吗？还有这希腊式的鼻子、健康的肤色……小葱诧异地问道：什么是希腊式的鼻子？郑氏忙咳嗽一声，笑道：我是说，她的鼻梁很高、很直……众人听得云里雾里，大苞谷将娘的话翻译给黛丝听。十日之内，周边来报，闻船主船队来此，全浙紧急布防，已将宁波沿岸防得水泄不通，禁船往来。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.1. Take an examination of Putonghua certificate (Chinese teachers should be above Grade II and Grade a; Other subjects should be above Grade II and Grade B)