We haven't been able yet to determine in terms of genes what makes a human being a human and not another mammal.

We haven't been able yet to determine in terms of genes what makes a human being a human and not another mammal.

我们还不能确定是什么基因使人类成为人类而不是其他哺乳动物。

-- Walter Gilbert 沃尔特·吉尔伯特