This new study looks in more detail at the effect of a half-hour delay on school start time by asking students to fill in questionnaires at the start and end of the three-month study.
这项新的研究更细的研究延后上学半个小时会产生的影响，在研究开始和三个月后研究结束的时候，学生们被要求填写一份调查问卷。
This new study looks in more detail at the effect of a half-hour delay on school start time by asking students to fill in questionnaires at the start and end of the three-month study.
这项新的研究更细的研究延后上学半个小时会产生的影响，在研究开始和三个月后研究结束的时候，学生们被要求填写一份调查问卷。
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