在恐怖电影中看到血可能会让你捂住眼睛，但真正的血一点都不可怕。
Seeing blood in a horror movie might make you cover your eyes, but real blood isn't scary at all.
现代3D技术的工作原理是通过快速闪动两个版本的电影，并将它们投射到每只眼睛上。
Modern 3-D technology works by rapidly flickering two versions of the movie and projecting them onto each eye.
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。
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.
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