基本解释[天文學]偕日落夕沒偕日降英汉例句雙語例句The heliacal rising or setting of a star indicates to within a few days the date in the annual day-cycle.星辰偕日陞降，說明了其在幾天內年日循環的日期。heliacal setting更多例句词组短语短語heliacal rising and setting 偕日陞降heliacal rising or setting 偕日陞落heliacal setting更多词组专业释义天文學偕日落夕沒偕日降