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unidentified flying object
Noun
vật thể bay không xác định
a mysterious object that some people claim to have seen flying around in the sky and assume that it is a spaceship from another world
"The pilots reported encountering an unidentified flying object that moved at high speeds and changed direction abruptly ."
identified
Adjective
được xác định, được nhận diện
having been recognized or determined
"The identified pattern in the data helped researchers draw significant conclusions ."