UFO

Từ điển Việt Anh Việt 4in1 - English Vietnamese 4 in 1 Dictionary

UFO /ˈjuːfəʊ, ˌjuː ef ˈəʊ $ -foʊ, -ˈoʊ/ BrE AmE noun [countable]
(unidentified flying object) a strange object in the sky, that some people believe is a ↑spaceship from another world SYN flying saucer