translation.en: It's easy to imagine how particularly those parts of our bodies were quickly influenced by selection from the environment and shifted frequencies of genes But if we look on other parts of our bodies where we don't directly interact with the environment -- our kidneys, our livers, our hearts -- there is no way to say, by just looking at these organs, where in the world they would come from.
translation.zh: 不难想象 身体这些部位 能够很快被自然选择所影响 并改变相关的 基因频率 如果我们看看那些 不直接接触外界环境的部位 如肾脏 肝脏 心脏 就完全不可能 通过观察这些器官 来判断人种 由此可推断出