他们发现，他们的转基因同种异体可分为两组，其中一组也与中美洲和南美洲印第安人的基因分型相对应。
They found that their Gm allotypes could be divided into two groups, one of which also corresponded to the genetic typing of Central and South American Indians.
贩毒团伙发现，拉丁美洲最穷最弱的国家是他们新的理想家园。
Drug-trafficking gangs find a promising new home in some of the poorest and most vulnerable countries in the americas.
俄勒冈大学和俄勒冈州立大学的研究人员对中美洲的切叶蚁进行了研究，他们发现，蚁群中的年轻和精力充沛的成员被委派去做最艰难的工作——将蚁群收集起来的叶片切成碎片。 这些身强力壮的切叶蚁用它们锐利的牙齿做起这种工作来很有效率，但是随着年龄的增长，它们的牙齿也会变得破旧而迟钝。
A study of Central American leaf-cutter ants has shown that the younger and more vigorous members of the colony are given the toughest job of cutting through the leaves they harvest.
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