The reason is that after a favored version of a gene has swept through the population, mutations start building up in its DNA, eroding the uniformity that is evidence of a sweep.

原因在于，当一个理想版本基因“扫描”一个人群，变异便开始在DNA中逐渐累积，这会将基因的统一性——基因扫描的证据——加以破坏。

youdao

Take a medium-size soft brush and, using a metallicgrey, start from the inner eyelidand sweep the shadow across.

用中等大小的眼影刷，选用金属色调的灰色，从靠里面的眼睑开始刷起。

youdao

Let's start to sweep the room right now.

咱们现在就立刻开始打扫这个房间。

youdao

And last season at this time, the Vikings extended Childress through 2013 based on their impressive 8-1 start that featured a sweep of those dreaded Packers.

FORBES: After Childress Walks The Plank, What's Next For Favre?