这些儿童分为三组：课后学音乐组，课后做运动组，以及课后完全无安排组。

The youngsters fall into three groups: those who take after-school music, those who do after-school sports, and those with no structured after-school program at all.

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在研究中，402名来自纽约四所低收入地区高中的9年级和10年级的学生被分为三组。

In the study, 402 9th- and 10th-grade students from four New York City high schools in low-income areas were divided into three groups.

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他们可以被分为三组。

They can be divided into three groups.

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