N-COUNT
(尤指对不寻常或意外事物的)所见，目睹
A sighting of something, especially something unusual or unexpected is an occasion on which it is seen.
例句
...the sighting of a rare sea bird at Lundy island...
在兰迪岛上看到一种珍稀海鸟
The National Weather Service has reported several tornado sightings in Illinois.
美国国家气象局报道说在伊利诺伊州出现了几次龙卷风。