| 释义 |
astronomical unit astronomical unit n.Abbr. A.U.（名词）缩写 A.U.A unit of length used in measuring astronomical distances within the solar system equal to the mean distance from Earth to the sun, approximately 150 million kilometers (93 million miles).天文单位：一种长度单位，用来测量太阳系中天体间的距离，与地球到太阳的平均距离相等，约为15,000万公里（9,300万英里） |