(1) [deceased grandfather]∶已故的祖父
(2) [ancestors]∶祖先
为了找出人种的社会定义与遗传渊源之间的关联，科学家需要可靠的方法，以祖考分类人群。
AS A FIRST STEP to identifying links between social definitions of race and genetic heritage , scientists need a way to divide groups reliably according to their ancestry .
祖考