It should be noted that the two groups of children had been carefully matched by the investigators so that they were comparable in age, ethnicity, race, and social class.
值得注意的是，调查人员对这两组儿童进行了仔细的比对，以便他们在年龄、民族、种族和社会阶层方面具有可比性。
In such studies, researchers would need to follow groups of children with and without music lessons over a long period of time—even if the assignments are not completely random.
在此类研究中，研究人员需要在很长一段时间内对上音乐课和未上音乐课的不同小组的儿童进行追踪——即使任务并不是完全随机的。
The two groups of children have quite different characteristics.
这两组儿童具有截然不同的特点。
I saw groups of children passing by the house.
我从窗口望出去，看见成群的孩子们从房子前面走过。
Look! Groups of children are playing on the ground.
瞧，三五成群的孩子在操场上玩耍。
All strep infections were recorded for both groups of children.
各组儿童的链球菌感染均被记录。
In another scenario, groups of children played a new board game.
在另一场试验中，一群孩子玩了一个新的棋盘游戏。
She spends her Easter holidays taking groups of children to France.
她带领一群孩子去法国过复活节。
She spends her Easter holidays taking groups of children to France.
她带领一群孩子去法国过复活节。 。
When groups of children congregate to play, Callie does not join them.
一群孩子雀跃着玩耍时，卡莉不会参与进去。
Observe the clinical treatment of two groups of children with adverse reactions.
观察两组患儿的临床治疗与不良反应情况。
An outbreak is most likely to happen among small groups of children who haven't been vaccinated.
这爆发很可能是在未接种的少数儿童群体发生。
Recently, for example, psychologists at Yale University showed a cartoon to two groups of children.
例如，最近耶鲁大学的心理学家向两组孩子展示同一组漫画。
Mueller and Dweck, 1998. We gave two groups of children problems from an IQ test, and we praised them.
米勒和德韦克，1998。我们给两组孩子智商测试的问题，并且称赞他们。
Nigel Spence, from Childfund, says the project has shown the similarities Shared by both groups of children.
儿童基金会的史潘斯说，这个方案展现出两组孩童分享的相似处。
As an instructional assistant for a public school, part of my job involves teaching small groups of children.
我在一家公立学校当指导员助理，我工作职责的一部分是给一些小孩子上课。
When groups of children congregate to play, Callie does not join them.Even at home, she is quiet and withdrawn.
一群孩子雀跃着玩耍时，卡莉不会参与进去。
When groups of children congregate to play, Callie does not join them. Even at home, she is quiet and withdrawn.
一群孩子雀跃着玩耍时，卡莉不会参与进去。
In one study, the researchers conducted DNA analysis on dust samples taken from mattresses of the two groups of children.
其中一项研究，研究人员提取并分析了这两组儿童床垫中取样的的DNA样本。
Methods To observe changes of biological indexes of two groups of children whose family use coal-biomass briquette and raw coal respectively.
方法观察使用不同型煤家庭的两组儿童生物学指标的变化。
So at the end of the next four years, I decided that groups of children can navigate the Internet to achieve educational objectives on their own.
又过了将近四年，我认为这些孩子可以自行通过浏览网络来达到教育的目标。
The ferrum and copper level of hair and ending capillary were determined by XRF on the two groups of children with anemia and compared with normal level.
对两组贫血患儿用XRF法测定头发及末稍血微量元素铁、铜含量，并与正常值做对比研究。
So at the end of it, we concluded that groups of children can learn to use computers and the Internet on their own, irrespective of who or where they were.
因此，最终我们得出一个结论，那就是成组的孩子可以自己学习如何使用电脑和互联网，任何地方的任何孩子都可以。
This time, they recruited two groups of children typical of those living in the area, aged three and between eight and nine, from nurseries and schools in Southampton.
这一次，他们召集了居住在这一地区的普通孩子，将他们分为两组： 一组年龄在3 岁，另一组则在8岁到9岁之间，他们分别来自怀特岛的托儿所和学校。
Results clinical symptoms and signs of two groups of children are improved, and the therapeutic effect of the observation group is obviously better than control group (P<0.05).
结果两组患儿临床症状、体征均得以改善，观察组改善明显优于对照组（P<0.05）。
The study followed four groups of children: one with supportive parents, one with stimulating parents, one whose parents combined both qualities and a final group who offered neither.
这一研究跟踪研究了四组儿童：一组儿童的家长是支持型的，一组是激励型的，一组是支持激励相结合的，最后一组儿童的家长既不支持也不激励。
The study followed four groups of children: one with supportive parents, one with stimulating parents, one whose parents combined both qualities and a final group who offered neither.
这一研究跟踪研究了四组儿童：一组儿童的家长是支持型的，一组是激励型的，一组是支持激励相结合的，最后一组儿童的家长既不支持也不激励。
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