in astronomy, a unit of length equal to the distance that light travels in one year in a vacuum, approximately 9460 thousand million km (about 5878 thousand million mi)
| 单词 | light-year |
| 释义 | light-yearnounin astronomy, a unit of length equal to the distance that light travels in one year in a vacuum, approximately 9460 thousand million km (about 5878 thousand million mi) |
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