N-COUNT
(尤指對不尋常或意外事物的)所見，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...
在蘭迪島上看到一種珍稀海鳥
The National Weather Service has reported several tornado sightings in Illinois.
美國國家氣象局報道說在伊利諾伊州出現了幾次龍卷風。