And while thus buzzing freely from fall to fall, he is frequently heard giving utterance to a long outdrawn train of unmodulated notes, in no way connected with his song, but corresponding closely with his flight in sustained vigor.

就这样从一个坠落到另一个坠落自由自在地嗡嗡作响，人们经常听到他发出一长串未经调制的音符，这些音符与他的歌曲毫无关系，但与他持续的活力飞行密切相关。