| 释义 |
astronomical unitn.（名词）abbr. A.U.【缩写】- 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）
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