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Từ điển Oxford Advanced Learner 8th
light year
ˈlight year [light year light years] BrE NAmE noun
1. (astronomy)the distance that light travels in one year, 9.4607 × 10 12 kilometres
•The nearest star to earth is about 4 light years away.
2. light yearsplural a very long time
•Full employment still seems light years away.
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