population gene frequency 群体基因频率
·2,447,543篇论文数据，部分数据来源于NoteExpress
But the remarkable and good news is that we have cut the frequency of tornado fatalities, in deaths per million population, by at least fourfold in the past century.
FORBES: The Great Tornadoes Of 2011 Put In Perspective
Population growth and migration from western Europe may have driven up the frequency of people carrying haplogroup H.
BBC: Making of Europe unlocked by DNA
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