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。
The proposed increase for these applications, to $420 from $355, is substantial in percentage terms—18%—but an increase of $65 is unlikely to deter many people, given the application's purpose.
按照增费提议，这些申请每份将从355美元涨到420元，实际增长18%。 但这65美元的增长似乎并不能阻止人们放弃移民申请的决心。
There are concerns about the liquidity of this paper, but the yield pickup is substantial, 1.05 percentage points more than U. S. Treasurys on the fixed-rate portion of the Citi issue.
人们担心这部分债券的流动性，但收益率却出现了明显回升，花旗所发债券的固定利率部分的收益率比美国国债高出了1.05个百分点。
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