So what this means now is that those traits we then look at and so readily see -- facial features, skin color, hair structure -- are not determined by single genes with big effects, but are determined by many different genetic variants that seem to vary in frequency between different parts of the world.
这意味着 那些显而易见的特征 包括 面部特征 肤色 毛发结构 都不是由单个其重大作用的基因决定的 而是许多不同基因变体共同作用的结果 而在世界不同的地方 这些变体变化呈现不同频率