当男性成熟的时候，他们的声音会变得低沉，有时候也会粗糙。
As men mature, their voices deepen and sometimes become more rough as well.
研究者说：这证明了至少在这个尼安·德塔家庭中，女性是来自群体外的，而男性成熟之后仍然留在家里。
Proof, say the researchers, that at least in this Neanderthal family, the women came from outside the group, while the men remained within the family group on reaching maturity.
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