By early 2000, it seemed clear to Bygren that the feast and famine years in 19th century Norrbotten had caused some form of epigenetic change in the population.

很显然，19世纪北搏腾丰年和歉年导致了该地区人口外基因改变，这点早在2000年初本内已经很清楚。

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So he drew a random sample of 99 individuals born in the Overkalix parish of Norrbotten in 1905 and used historical records to trace their parents and grandparents back to birth.

他随意选取了99名1905年在北搏腾奥佛卡利克斯教区(Overkalix parish)出生的孩子作为研究样本，通过详尽的历史档案，一直追溯到他们的父母以及祖父母。

youdao

So he drew a random sample of 99 individuals born in the Overkalix parish of Norrbotten in 1905 and used historical records to trace their parents and grandparents back to birth.

他随意选取了99名1905年在北搏腾奥佛卡利克斯教区(Overkalix parish)出生的孩子作为研究样本，通过详尽的历史档案，一直追溯到他们的父母以及祖父母。

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