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Still use the-I option to insert rules,-I INPUT 2 means to add rules in the INPUT chain, and the number of the added rules is 2. OK, try it yourself.Let's understand such a problem first, If our front-end development needs are the needs given to us by the demand side, It is possible that a front-end developer will deal with multiple demanders, Therefore, it will keep in touch with multiple demand parties. Then in the program it means keeping references to multiple objects, The larger the program, There will be more and more objects, The relationship between them will become more and more complicated. Now if there is an intermediary (if it is our supervisor) to meet the needs of multiple demanders, Then the demander only needs to give all the requirements to our supervisor, who will assign tasks to us according to our workload in turn. In this way, our front-end development does not need to contact with multiple business parties, we only need to contact our supervisor (i.e. Intermediary), which weakens the coupling between objects.　　于萍早年失去父母，是姐姐把她抚养成人，但姐姐又在她被劳教时去世，于萍的私生子晶晶也被送给了别人。于萍失去了所有的亲人，也失去了生活的信念，为了找到儿子见最后一面，她从管教所逃了出来。呼毕泰的真诚使于萍深受感动，并承认了自己是逃犯，但避而不谈找孩子的事。呼结泰对她产生了同情，劝她回去自首。于萍感到呼毕泰是真诚的，为了在找到儿子晶晶前有个落脚的地方，想以身相许暂住在此地，但被呼毕泰拒绝了。The above example show that that default policy for the FORWARD chain in the filter table is modify to ACCEPTTwo, civil aviation pilot level:　　无法砍树，拿不到工钱，这也就意味着光头强可能今年没办法回家过年了。得知此事，熊大和熊二动了恻隐之心，尽管光头强和他们平日里斗智斗勇，是一对冤家，但两头熊还是决定在这个节骨眼上帮助他。它们将坏掉的伐木机改装成为了汽车，打晕了光头强想要送他回家，由此引发了一连串的笑话。