广播电视英语短句 第 127 课：脑力健康-4

It looked at the effects of a later start to the school day. 这项研究关注了延迟上学时间的影响。

For the study, an independent high school in Rhode Island delayed morning classes from eight o'clock to eight-thirty. 对于这项研究，罗德岛州一所私立高中延迟了早课时间，由原来的8点改为8点30。

The change affected about two hundred students in grades nine through twelve. 这个变化影响了2千名9到12年级的学生。

In online surveys, students reported feeling less sleepy during the day. 在网上的调查中，学生称白天更少会感到困乏。