In the study, the researchers let volunteers read, play games and watch movies on a screen for different time while measuring how much light their eyes received.
在这项研究中，研究人员让志愿者在不同时间于屏幕上阅读、玩游戏和看电影，同时监测他们的眼睛接收到的光线。
If someone asks you why he needs to watch this, and is that necessary to take such a long time to study it?
如果有人想您提这样的问题，我为什么要看这个节目呢？这么长时间，我还要研究它，有这个必要吗？
After class, 60% of junior students spend their time on study, reading books or doing homework at home. 5% of them watch TV and 15% play computer games.
放学后，60%的初中生课外时间在学习，阅读或者在家做作业。5%的学生看电视，还有15%玩电脑游戏。
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