三大类群
The three major groups
以上为机器翻译结果，长、整句建议使用 人工翻译 。
结果20个民族聚合成主要的三大类，各类群间的体质发育存在明显差异。
Re- suits Three categories were assembled from 20 minority groups. By compared the physical development among these three categories, there were statistical significant differences.
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