The key to their approach was a statistical concept called heritability.
他们的方法的关键是一个名为遗传力的统计概念。
In broad terms, the heritability of a trait measures the extent to which differences among members of a population can be explained by differences in their genetics.
广义上讲，性状遗传性衡量的是群体成员间的差异在多大程度上可以用基因差异解释。
But perhaps we need to look again at the evidence for these high levels of heritability.
