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。
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。
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.
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