那些因为某些需要得带手机的学生必须取得父母和老师的同意，并且必须在上课期间上交手机。

Those who require their phones for some need must get their parents' and teachers' approval and must hand their phones over during class time.

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为了衡量上课期间上网对学生注意力分散的影响，研究人员对密歇根州立大学修读心理学入门课程的500名学生进行了评估。

To measure the effects of Internet-based distractions during class, researchers evaluated 500 students taking an introductory psychology class at Michigan State University.

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上课期间，我们随意的交谈着。

During the class, we had a free talk.

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