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The two groups of children have quite different characteristics.
这两组儿童具有截然不同的特点。
《牛津词典》
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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。
youdao
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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。
youdao