This finding bolsters the so-called gestural theory of language evolution, whose proponents argue that language evolved initially as a gesture system before becoming vocal. 這項發(fā)現支持了語(yǔ)言演化的肢體理論，提倡這理論的人認為語(yǔ)言最初是從動(dòng)作系統開(kāi)始，后來(lái)才發(fā)展出語(yǔ)音系統。
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