北美歌雀在切换到另一种类型之前，会一声一声地重复其中的一种，与之不同的是，北美歌雀会连续地创作更长的、更多变的歌曲，而不会重复。
Unlike the song sparrow, which repeats one of its several song types in bouts before switching to another, the warbler continuously composes much longer and more variable songs without repetition.
我们在一些歌雀的领地重复了这种实验。
We repeated this experiment in a number of song sparrow territories.
一种常见的北美雀鸟(歌雀)，长有条纹状、褐色的羽毛，以其宛转动听的歌声著称。
A common North American sparrow (Melospiza melodia) having streaked brownish plumage and noted for its melodious song.
知更鸟、歌雀、红翼鸫在部分光秃而潮湿的田野里轻吟出银铃般的旋律，犹如冬天最后的雪花簌簌地飘向大地。
The faint silvery 1)warblings heard over the partially bare and moist fields from the 2)bluebird, the 3)song sparrow, and the 4)redwing, as if the last flakes of winter tinkled as they fell!
在每一次实验里，研究人员对文雀们播放同一首歌直到它们熟悉这首歌的调子，然后把歌的音符打乱编成一些新歌。
In each experiment, the birds were presented with the same songs until they became familiarized with the tune. The researchers then created novel songs by shuffling the notes around.
在每一次实验里，研究人员对文雀们播放同一首歌直到它们熟悉这首歌的调子，然后把歌的音符打乱编成一些新歌。
In each experiment, the birds were presented with the same songs until they became familiarized with the tune. The researchers then created novel songs by shuffling the notes around.
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