飞碟悬停在沙漠上空。

A ___UFO hovers over the desert.

昨晚新闻报道有人拍摄到了不明飞行物。

The news reported someone filmed a ___UFO last night.

孩子们对天空中出现的UFO兴奋不已。

The kids got excited about the ___UFO spotted in the sky.