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Some birds, such as the white-crowned sparrow, have only one song.
有些鸟，例如白头雀，只会唱一种歌曲。
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Researchers compared white-crowned sparrow songs recorded in 1969 and 2005.
研究人员比较了白冠麻雀1969年至2005年的叫声记录。
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Researchers compared white-crowned sparrow songs recorded in 1969 and 2005.
研究人员比较了白冠麻雀1969年至2005年的叫声记录。
youdao