Random genetic drift has certainly played a big role in human evolution.

随机漂变对人类进化的作用的确巨大。

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The unflattering answer could be for no other reason than random genetic drift.

答案是基因随机变异，这一点儿不讨人喜欢。

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Much change is due to random genetic drift rather than positive selection. It could be called the survival of the luckiest.

许多变化源于基因的随机变异而非自由选择。我们可以称其为幸运者生存。

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