不明飞行物。
Last night the sky appeared a movement of an unknown object, Alice considered a UFO, because it is flying very fast.
昨晚天空出现一个不明物体的运动,爱丽丝认为是不明飞行物,因为它飞得很快。
An unknown object was flying across the sky just when he looked up. It was when he looked up that an unknown object was flying across the sky.
就在他抬头看时,一个不明的物体在就在他抬头看时,天空掠过。天空掠过。
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