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Từ điển Oxford Advanced Learner 8th
UFO
UFO [UFO UFOs] (also ufo)BrE [ˌjuː ef ˈəʊ] NAmE [ˌjuː ef ˈoʊ] BrE [ˈjuːfəʊ] NAmE [ˈjuːfoʊ] noun (pl. UFOsor ufos)
the abbreviation for ‘Unidentified Flying Object ’ (a strange object that some people claim to have seen in the sky and believe is a ↑spacecraft from another planet)
compare ↑flying saucer
Word Origin:
1950s: acronym from unidentified flying object.
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