| 单词 | light year |
| 释义 | light year From Longman Dictionary of Contemporary EnglishMeasurement, Astronomylight yearˈlight year noun [countable]1 TMHAthe distance that light travels in one year, about 9,460,000,000,000 kilometres, used for measuring distances between starsa star 3,000 light years from Earth2 → light years ahead/better etc than something3 → light years ago |
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