Tra từ astronomical unit - Từ điển Oxford Learners Wordfinder Dictionary

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Từ điển Oxford Learners Wordfinder Dictionary

astronomical unit astroˌnomical ˈunit 7 [astronomical unit] BrE NAmE noun (abbr.AU) (astronomy) a unit of measurement equal to 149.6 million kilometres, which is the distance from the centre of the earth to the sun