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。
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。
Another aspect of this problem is controlling asthma among children in these groups.
这个问题的另一个方面是在这些群体的儿童中控制哮喘。
In a separate experiment, 140 of the children were divided into two groups.
在单独实验中，140个孩子分为两组。
These groups of people are concerned about the media's impact on young. Children.
这些群体都很关心媒体对青少年和儿童影响。
These groups of people are concerned about the media's impact on young. Children.
这些群体都很关心媒体对青少年和儿童影响。
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