去年，苹果公司发布了一款个人电脑，它是由液体冷却的，液体通过处理器里的小通道输送。

Last year, Apple launched a personal computer that is cooled by liquid that is pumped through little channels in the processor.

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纤维在肺的小通道里定居和覆盖于它的表面。

The fibers become lodged in its small passageways and in the surface of its lining.

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两个小通道上面分别写着分子通道和缩小通道。

Two small channels above writing respectively molecules and narrow channels.

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So, that is just a quick example for some of you, you might be very familiar with ion channels, others might not know what these are, so I'll just tell you quite briefly that ion channels are these very massive transmembrane proteins.

这对你们中的某些人来说仅仅是个小例子，有些人可能已经非常熟悉离子通道这个概念了，但有些人可能还不清楚，那么就让我来简单地介绍一下离子通道,就是这些巨大的跨膜蛋白。

麻省理工公开课 - 化学原理课程节选

So, for example, if we look at sodium channels, and sodium channels are some of the particularly prevalent ones when we're talking about neurons, if you think about the cell membrane, and this little green cartoon is me trying to show a sodium channel here, and in this case, you can see that it's closed, such that no ions are getting through.

比如，让我们来看一下钠离子通道，钠离子通道是我们会经常遇到的几个之一,在讨论神经元的时候，如果大家想想细胞膜，而这个绿色的小示意图就是我用来表示,钠离子通道的，在这种情况下，大家可以看到它是关闭的，因此没有离子可以通过。

麻省理工公开课 - 化学原理课程节选