利用dna序列的公共数据库，他们发现说非声调语言的人通常有两种不同基因的突变形式。

Using public databases of DNA sequences, they found that people who speak non-tonal languages commonly have mutated versions of two different genes.

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这种非语言沟通包括，脸部表情和手势、声调、眼神接触、肢体的位置和姿势。

This non-verbal communication includes facial expressions and hand gestures, intonation, eye contact, body positioning and body posture.

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