Although we talked about Vitamin D and sunlight, it can make a huge difference in how you feel if you go to a tanning salon to get some light on your skin.

尽管我们已谈到维生素D和阳光，但是如果你刻意去参加日晒沙龙来摄取阳光到皮肤的话，它会让你感觉到巨大的差别。

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How much does it cost to change a light bulb?

更换一个灯泡到底需要花费多少钱？

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Find out your plant’s foot-candle requirement, which is how many candles it would take to light the plant from one foot away.

找出植物所需要的“英尺烛光”，即在一英尺的距离需要点多少蜡烛来提供它光。

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And this is a very fast speed, of course, it's about 700 million miles per hour. So, one way to put that in perspective is to think about how long it takes for a light beam to get from earth to the moon. Does anyone have any guesses? Eight seconds, that sounds good.

当然这是一个非常快的速度，它大约是每小时7亿英里,为了更形象化，我们,看看光从地球到月球,需要多少时间，你们猜猜是多少？,8秒，猜的不错。

麻省理工公开课 - 化学原理课程节选

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Every room, for example, has a lighting network that decides, when a person enters, whether to turn the light on and, if so, how bright to make it.

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"I'd be very interested in maybe having Linda Tripp, maybe having a whole host of people ... and (Independent Counsel) Ken Starr, all of whom might shed enormous light as to how it is we got here, " said Sen.

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