But so far the only evidence for a genetic component has been through statistics, the relationship being inferred mathematically from comparisons of twins and other such studies of close relatives.

但迄今为止，遗传基因所占比重的仅有的证据只是一些统计数据，即，从对双胞胎的比较，以及对其他血缘接近者的研究中得出的数学统计关系。

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