ufo
US
UK UFO n: informal, initialism (unidentified flying object)
SC 不明飞行物 bù míng fēi xíng wù
Roger claims that he once saw a UFO just above the horizon.
There have been sightings of UFOs for decades.
罗哲说，他有一次在地平线上方看到了不明飞行物。// 几十年来，一直有对不明飞行物的目击。
unidentified flying object n: (UFO, flying saucer)
SC 不明飞行物 bù míng fēi xíng wù
SC 飞碟 bù míng fēi xíng wù，fēi dié
Several residents of the small town claim to have seen an unidentified flying object last night.