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學習快評丨qibao666888　　土??(tu)星?(xing)環(huán)??(huan)這??(zhe)個??(ge)“大??(da)圓??(yuan)環(huán)??(huan)”的??(de)直??(zhi)徑??(jing)大??(da)約??(yue)是??(shi)28萬??(wan)公??(gong)里?(li)??，相??(xiang)當??(dang)于??(yu)地??(di)月??(yue)距??(ju)離??(li)的??(de)三??(san)分??(fen)之??(zhi)二??(er)??，但??(dan)是??(shi)土??(tu)星?(xing)環(huán)??(huan)的??(de)平?(ping)均??(jun)垂??(chui)直?(zhi)厚??(hou)度??(du)卻??(que)只??(zhi)有??(you)10米?(mi)左??(zuo)右??(you)??。??所??(suo)以??(yi)說??(shuo)??，土??(tu)星??(xing)的??(de)光??(guang)環(huán)??(huan)“薄??(bo)如??(ru)蟬??(chan)翼?(yi)”??，那??(na)它??(ta)是??(shi)由??(you)什??(shen)么??(me)組??(zu)成??(cheng)的??(de)呢??(ne)？??。