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。
I used to watch TV on weekends, but now I have to study all the time, because I must study hard, and go to a good school.
我经常在周末看电视，但现在我要学习所有的时间，因为我必须努力学习，去一个好学校。
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？
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