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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.Iptables is actually a command line tool located in user space. We use this tool to operate the real framework.当嫂子突然死亡，哥哥被指控为杀害妻子的犯罪嫌疑人并潜逃在外，虽然法庭判决哥哥是杀人凶手，并且发布逮捕令，但是，在法国巴黎学设计的Thantawan仍然相信她认识的哥哥不是杀人凶手，所以决定放弃自己的梦想回到泰国寻找真相证明哥哥的清白。Human's classification consciousness and practice on vegetation, animals and other organisms have existed since ancient times. They existed in ancient China and ancient Greece, and developed into a science-taxonomy. However, the early classification was mainly based on morphology, such as the shape of roots, stems and leaves. Taxonomy based on morphology is the oldest discipline in biology, and the earliest phyla, classes, orders, families, genera and species basically came from here. Taxonomy in the general sense refers to a specialized discipline that identifies, identifies, describes, names and classifies organisms. The task and purpose of taxonomy can be divided into two parts:舞台は、南極の昭和基地から離れる事1000キロ、標高3800ｍ、平均気温マイナス54度、世界で最も過酷な観測地帯と言われる「ドーム基地」。生物はおろかウイルスさえも生存する事が許されない、地の果てである。この物語は、第38次隊の7人の「南極観測隊」の話である。7人のうち3人が研究者。後の4人は設営隊員（サポート要員）である。しかし、結局は、ただの7人のオジサンである。そんな、ただの7人のオジサンが、狭いドーム基地で1年間を一緒に暮らすのだ。このドーム基地での楽しみといえば、みんなで美味しい料理を食べる時のみ。それ以外の、楽しみはほとんどない。あるのは、厳しさ・過酷さ・息苦しさ・ストレス・不安・心細さ。極限状況であるが、逃げる場所もなければ、頼る人も隊員以外にいない。そんなシチュエーション、蚊帳の外から見れば滑稽でしかないのだ。日本では考えられない事件が起こるが、最後は、主人公の西村隊員の美味しい料理を食する事で、7人が再び１つになっていく。実にダサくて、カッコよくて、でもバカバカしい、７人のオジサンの予測不可能なコメディドラマである。In order to make good use of the principle of composite reuse, we first need to distinguish the relationship between "Has-A" and "Is-A".