An unidentified flying object, or UFO, is any real or apparent flying object which cannot be identified by the observer and which remains unidentified after investigation.
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UFO or Die 表演者
Have you ever seen aliens or UFO in the space?
你们在太空看到过外星人或飞碟吗？
The thing is, I am contacted far too often by people saying they have seen an unidentified flying object, or UFO.
事情是这样的，我经常与那些自称目击不明飞行物(ufo)的人接触。
It might be a natural feature formation, or possibly a sunken, round man-made object. UFO Battles Captured on Video?
这种形状可能是由一种自然特征所形成，或者也可能是一个沉没在海底的圆形人造物体。
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