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Half-connection survival time: refers to the longest survival time of entries in the half-connection queue, that is, the longest time from receiving SYN packet to confirming that this message is invalid. This time value is the sum of the longest waiting time of all retransmission request packets. Sometimes we also call the half connection survival time Timeout time and SYN_RECV survival time.从太空俯瞰地球，我们的地球之美令人心旷神怡。与此同时，我们生活的时代，地球表面正在发生着前所未有的迅速变化，我们目睹着人类行为给地球带来积极/消极的影响。我们试着换一个角度，借助架设在地面、空中、太空中的拍摄设备，用更辽阔的视角讲述地球上的生命故事，以及前所未见的地球家园。面对女人，还是个年轻的女人，男人总是特别宽容的。A4.1. 2.2 Cornea and sclera.　　振兴柔道社的谎言、学校强制停赛的处分、古夏不可告人的过去、偶像女神的退团，以及最佳拍档的拆伙，随着难题一一爆发，袁非、郁佳和云青，又将会和柔道社的小伙伴们，迈向怎样的未来呢？Drawing a mind map allows you to actively think, sum up and express the information you accept or learn. Naturally, it is better to master the effect. It is only expressed in the form of images, branches and keywords of the mind map, which further increases the interest and so on.