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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.曹参一杆长矛握在手中，喊道：兄弟们，今天拼了，别忘我了，我们还有韩元帅。Shutter speed is also called slow shutter. It consists of an automatic shutter and a slow shutter of 1 to 16 seconds.本剧讲述了所有人都想走考上大学这条路,即使不是大学也要寻找自己的梦想的特性化高中的孩子们的故事。This paper mainly analyzes Reactor mode in detail. Netty uses Reactor mode to realize asynchronous event-driven network application framework, so it is very important to master Reactor mode in Netty's learning.下官告诉城中百姓，说这孩子是家中老仆的侄孙，因管教严格了些，他小孩子家就生气了，对外人说自己是被拐来的，请百姓若是见了他，务必要送来县衙……他把当日找玉米的经过细细说了，说最后从一个收夜香的王胡子的闺女秋霜嘴里问出玉米下落，老侯爷知道他去哪了？张槐心里觉得不妙，便问道：去哪了？(未完待续……) show_style();。