偶然获得一些物理知识。

Pick up some knowledge of physics.

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世界上这个地区的重要考古发现大都是偶然获得的。

Most of the important archaeological finds in this part of the world have been discovered accidently.

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但扫描也很难发现被选程度很弱的基因，所以它们可能只是偶然获得近期基因组身上压力的很小一部分。

But the scans also find it hard to detect weakly selected genes, so they may be picking up just a small fraction of the recent stresses on the genome.

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