The farther you go from Africa, the less genetic variety there is, because in a rapidly dispersing population genetic variety is lost faster by random failures to breed than it is replenished by evolution.

• 离非洲越远，基因的差异就越不明显，因为在快速的移民过程中，因随机繁衍而消除基因差异的速度比进化带来的基因差异快。