| 释义 |
light yearBrE /ˈlaɪt jɪə(r)/, /ˈlaɪt jɜː(r)/NAmE /ˈlaɪt jɪr/ noun(astronomy 天文学) the distance that light travels in one year, 9.4607 × 1012 kilometres 光年（指光在一年中走过的距离，为 9.4607 × 1012 公里）◆The nearest star to earth is about 4 light years away. 地球离最近的恒星大约为 4 光年。light years [pl.] a very long time 很长时间；很久◆Full employment still seems light years away. 充分就业好像依然遥遥无期。 |