他分析了鸣叫声的特征，包括每支“曲子”的发音次数——或者说音节、音节的长度以及鸣声频率。
He analysed the songs' traits, including the number of single sounds - or syllables - per song, the length of the syllables and the song's frequency.
他分析了鸣叫声的特征，包括每支“曲子”的发音次数——或者说音节、音节的长度以及鸣声频率。
He analysed the songs' traits, including the number of single sounds - or syllables - per song, the length of the syllables and the song's frequency.
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