The cases of natural selection that have been tracked so far take the form of substantial sweeps, with a new version of a gene being present in a large percentage of the population.

我们目前跟踪过的自然选择案例大多都较为全面经历过基因扫描，新版基因在某种人当中出现比例非常大。

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Now the selection formula can simply reference that flag to exclude a large percentage of the documents that would otherwise slow down the view.

现在选择公式可以只引用该标记即可排除大量的文档，而不排除这些文档就会降低视图的运行速度。

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The selection of effective plant percentage and stem thick can improve the resistance to viruses in population and the yielding ability.

群体有效株率和茎粗的选择可使抗病性和丰产性同步提高。

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The percentage of voters who called the selection of Edwards good or excellent -- 64 percent -- was about 10 points higher than the percentages of voters in 2000 who were pleased with either President Bush's choice of Cheney or Democrat Al Gore's choice of Sen.

CNN: Poll: Edwards viewed favorably