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。
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。
Seven A. M. the usual morning line-up. Start onthe chores, and sweep 'til the floors all clean.
早上七点开始，又是平常的一天。先开始扫地，扫到地面一尘不染。
Start frequency, stop frequency and sweep time of the signal synthesized by the method can be preset freely and controlled accurately.
被合成的频率扫描信号的起始频率、终止频率和扫描时间可根据需要随意设定，并且可以实现对三者的精确控制。
The wail of dying neutron stars would start low and sweep higher in an almost musical chirp.
濒死中子星的悲鸣会始于低吟，但很快地就扬高，变成高音调。
The wail of dying neutron stars would start low and sweep higher in an almost musical chirp.
濒死中子星的悲鸣会始于低吟，但很快地就扬高，变成高音调。
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