A widely distributed bird (Hirundo rustica) that nests in barns and caves and has a deeply forked tail, a dark-blue back, and tan underparts.是什么意思_A widely distributed bird (Hirundo rustica) that nests in barns and caves and has a deeply forked tail, a dark-blue back, and tan underparts.在线翻译_英语_读音_用法_例句