sighting
noun [ C ] uk/ˈsaɪ.tɪŋ/ us/ˈsaɪ.t̬ɪŋ/
看见，目击（尤指罕见或隐藏的人或物）
an occasion when you see something or someone, especially something that is rare or trying to hide
This is the first sighting of this particularly rare bird in this country. 这是在该国首次目击这种极为珍稀的鸟。