I was talking to one of my colleagues in the physics department the other day, and we ended up discussing how one discovery can change everything.
前几天我和物理系的一个同事聊天，聊天到最后，我们探讨了一个发明是如何改变一切的。
Most people don't tan after just one day at the beach, or one session in the tanning bed, because it takes time to make melanin.
大多数人只在沙滩上玩一天或者使用晒黑床一段时间不会被晒成古铜色的皮肤，因为黑色素的合成是需要时间的。
From this survey, one can estimate that fewer than one in five children have some contact with a hospital teacher—and that contact may be as little as two hours a day.
从这个调查中，我们可以估计不到五分之一的孩子和医院的老师有过接触——这种接触可能每天只有两个小时。
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