这些基因和变异到目前为止只有很少一部分是知道的。
Only very few of these genes and variants are known to date.
如同诺瓦克所阐述的，生命的出现，只需要分子服从选择和变异的力量。
As Nowak has shown, all that's necessary for life to emerge are molecules subject to forces of selection and mutation.
母体， 随机样本。 样本统计， 样本平均数和变异数的动差。
Populations, random samples. Sample statistics, moments of the sample mean and variance.
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