名词
中文翻译：不明飞行物同义词
同义词：
['flying saucer', 'unidentified flying object']
例句：
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1. UFOs have been sighted over the city many times in recent years.
近年来，UFO在城市上空被目击多次。
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2. The government has denied any involvement in UFO activities.
政府否认参与UFO活动。
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3. Some people believe that UFOs are extraterrestrial spacecraft.
有些人认为UFO是外星飞船。