"We discovered 150 or so genetic markers that can highly predict whether or not a person has the genetic propensity to live to extreme old age."
VOA: standard.2010.07.14
And what Darwin is claiming here, and it's a controversial and interesting claim, is that language is special in that there's some sort of propensity or capacity or instinct for language unlike the other examples he gives.
达尔文在此所表达的观点,极具争议而又非常有趣,这个观点认为,语言之所以特殊,是因为总有某些倾向,能力或本能,使得语言与他所举的其他例子有所不同
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