They identified about 30 variants found at significantly higher rates in two groups of centenarians compared to a control group.

他们发现有两组的百岁老人有约30种变异显著高于对照组。

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For (the sake of) convenience , the two groups have been treated as one in this report.

为方便起见，这两个组在本报告中被视为一组。

《牛津词典》

Police moved in to separate the two groups, already sundered by distrust.

警方介入将已分裂又互不信任的两组人隔离开。

《柯林斯英汉双解大词典》

Yet there was no difference in calories between the two groups for foods that the parents would have chosen for themselves.

VOA: special.2010.01.27

A studio of three hours' lecture in a large lecture hall, and two hours of recitation in groups of thirty.

在一个大的讲堂的教室里,讲三个小时讲座，并以三十人为一组,进行两小时背诵。

麻省理工公开课 - 媒体、教育、市场课程节选

This is the year in which we have two dominant groups in the new revolutionary Parliament.

这也是我们在新革命性的议会中,拥有两个占统治地位的团体的一年。

耶鲁公开课 - 弥尔顿课程节选

About 9, 000 soldiers from the 3rd Infantry Division arrived in the Central Command region in two groups -- in September, 2002, and this January.

CNN: Pentagon releases Iraq troop rotation plan

By comparison, the big government study enrolled women and randomly assigned Prempro to one half, and placebo to the other half, resulting in two groups that were indistinguishable from one another.

FORBES: A Consumer's Guide To Medical Jargon

They charted changes in the genetic activity in two groups of ageing mice, one group on a standard diet and the other whose diets have been cut to 76% of the standard diet.

BBC: 'Eating less may prevent Alzheimer's'