Scientific literature has been littered with studies over the past 40 years documenting the superior language skills of girls, but the biological reason why has remained a mystery until now.

在过去的四十年内，科学文献充斥着女孩具有优越语言能力的研究，但至今仍没有生物理论的支持。

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They were not sophisticated teenage girls, not by Western standards, but there had been no mystery about sex and procreation for them since soon after they had entered puberty.

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