sea swallow
sea-swallow的词性:n.(名词)
1. Any of various terns, especially a common tern (Sterna hirundo) that breeds within the Arctic Circle. 海鸥,海燕:任一种燕鸥,尤指一种普通燕鸥(普通燕鸥 燕鸥属) ,它在北极圈内繁殖