我们经常看到孩子们玩玩具机器人。

We often see kids play with toy robots.

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这就是为什么我们经常看到斑马成群结队地行走和奔跑。

That's why we often see zebras walking and running in groups.

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我们经常看到他躺在一张长沙发上看书。

Most often we would find him lying on a couch, reading.

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So the 3 s 1, or any of the other electrons that are in the outer-most shell, those are what we call our valence electrons, and those are where all the excitement happens.

它们是经常发生激发情况的,那也是我们所看到，我们称之为价电子，它们是经常发生激发情况的。

麻省理工公开课 - 化学原理课程节选

Now, we're left at the point that we're so often left what's the point of all of this?

现在，让我们看到经常关注的这些点,这里是什么意思呢？

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And when we talk about intensity in terms of units, we usually talk about watts, so if you change your lightbulb, usually you see the intensity in terms of watts.

当我们讨论强度的单位时，我们经常用瓦特，所以如果你更换灯泡，你通常会看到,以瓦特为单位的强度值。

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