Butbacteria and viruses breed fast, so natural selection hastime, within the spanof a human life, to make a difference.

但是细菌和病毒繁殖迅速，因此自然选择可以在短时间内发挥作用，使人们能够观察得到。

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But bacteria and viruses breed fast, so natural selection has time, within the span of a human life, to make a difference.

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