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For example, in recent studies, MIT students were shown dots on a screen and asked to say how many there were.

例如，在最近的研究中，麻省理工学院的学生被要求数出一块儿屏幕上有多少个圆点。

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Earlier studies have found that while more time spent in front of a screen led to lower well-being, physical activity improved one's state of mind.

以前的研究发现虽然长时间看屏幕会使身体素质降低，经常锻炼却能促进身心健康。

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And it allows him to screen multiple patient cell studies at once.

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