| 单词 | light year |
| 释义 | light yearˈlight year noun [countable] 1science, physics the distance that light travels in one year, about 9,500,000,000,000 kilometers (5.88 trillion miles), used for measuring distances between stars2light years ahead/better etc. than something informal much more advanced, much better, etc. than someone or something else: The show was light years ahead of its competition.3light years ago a long time ago |
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