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Lin Shucheng, vice-chairman of the Sichuan Provincial Committee of the Chinese People's Political Consultative Conference and secretary of the Liangshan State Committee, said that "Charming China City" has greatly enhanced our national cultural confidence and promoted tourism development. Last year, the growth rate reached 19.7%, and in the first quarter of this year, the growth rate reached 47%, showing a spurt of development.这个帖子一出。Public void notifyObservers () {Markmark Markmark《同居男女》讲的是一个俏房东和四个极品租客之间的囧事和趣事，故事以他们的“同居生活”为主线，折射当下年轻人的人际价值观和爱情观。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.