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So let's explain the rules of iptables in a common way. There was an analogy before, Each "chain" is a "checkpoint", Every message passing through this "level" must match the rules on this level. If there is a match, The message is processed correspondingly, For example, you and I are like two "messages" at the moment. Both of you and I are going to enter the customs at this moment. But the duke has a life, Only the imposing person can enter the customs, Those who do not meet this requirement are not allowed to enter the customs. So the soldiers guarding the customs followed the "rules" formulated by the duke. I began to look at you and me. In the end, you entered the customs smoothly, and I was rejected. Because you met the standard of "dignity", you were "released", while I did not meet the standard, so I was not released. In fact, "dignity" is a kind of "matching condition", "release" is a kind of "action", and "matching condition" and "action" form the rules.　　第二季中，崇尚自由主义的Ellen，把传统、白手起家的丈夫Scott拖出舒适区，去到康涅狄格州的一家嬉皮士咖啡店。他们在进行婚姻咨询诊疗前，有十分钟的时间在这里喝上一杯咖啡，整理自己的思绪，从贵格会争论到代词问题。在争论中，他们还会探讨过去的背叛，他们经历了哪些变化，以及身处一个不断变化的世界中，两人的关系在未来会是怎样。For example, in the above column, Xiao Hong suddenly didn't want to buy shoes, so he didn't want to accept the news of the seller's store, so Xiao Hong could cancel the subscription of the store.然后拍拍手掌，站在场地边缘端详道：好了。港口城市海昌，是一个以海洋科技为先导迅速发展起来的新兴沿海城市，这里不但是我国走向海洋的前沿阵地，也是境外间谍组织密切关注的焦点……