| 释义 |
astronomical unitBrE /ˌæstrəˌnɒmɪkl ˈjuːnɪt/NAmE /ˌæstrəˌnɑːmɪkl ˈjuːnɪt/ noun (abbreviation AU) (astronomy 天文学) a unit of measurement equal to 149.6 million kilometres, which is the distance from the centre of the earth to the sun 天文单位（即地球中心与太阳的距离，约合 1.496 亿公里） |