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。

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Surely, please watch me in the hand mirror. I'll reach under the gum with a measuring instrument.

完全可以，请看手镜里我是怎样做的，我要用计量用具捅到牙龈底下。

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An instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display.

仪表，钟：除了时钟以外的测量或指示时间用的仪器，尤指一种有数字表盘、移动指针或数字显示的机械或电子仪器。

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