在亚群体间缺乏基因流动时，群体间的遗传差异开始累积。

In the absence of gene flow between the subpopulations, genetic differences between the groups begin to accumulate.

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但是，时间一久，编译时间上的微小差异也会累积成明显的差异。

Over a long period of time, though, even a smallish difference in compile times adds up.

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这种差异是否有累积效应？

Does this have cumulative effects?

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