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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.《静静的白桦林》讲述了北京某医科大学毕业生乔楠因“考研加分”政策来到了父亲乔志达当年插队时生活过的长白山深处白桦岭，本想过两年就走的她发现那里是一个克山病高发区，很多患者面临着缺医少药的局面，经过艰难的抉择，她扎根白桦岭，还与林场工程师林枫相爱，最终她不仅和林枫携手建立起一所现代化医院，而且还获得了百姓赋予的“山妈妈”的光荣称号……“焦阳，纵使时间倒数，也许永远不会再见，但请你记得有一个叫林淼的人，很爱你。”这是林淼写在类自传体小说《时间倒数遇见你》的第一句话。When frying, remember to wipe off the juice on the surface of the steak, so that it will be fragrant!为了踏出崭新的一步，Aqours所得到的答案是什么？大家所向往的闪耀的前方！Tourism poverty alleviation, as an important part of the national poverty alleviation strategy, has become a powerful starting point and an important support for poverty alleviation in many regions. Ha Xuesheng, director of the program department of CCTV's financial channel, said that "Charming China City" helped the transformation and development of small and medium-sized cities and brought real value to the cities. The cities participating in "Charming China City" are mainly three or four lines. The program focuses on small and medium-sized cities that are "bred in an inner chamber, with no one knowing her" and gives them "timely help" in publicity and promotion.