我的意思是，只需想想当你的头在水下时，你实际能听见多小的外界噪音。

I mean, just think how little noise from the outside world actually reaches you when your head is underwater.

youdao

坚持用小尺寸。想想像蛋酒拿铁和摩卡这样的甜点，而不是饮料。

Stick to small sizes. Think of treats such as eggnog lattes and mochas as desserts, not drinks.

youdao

旁观者清，跳出你的小世界，别沉陷于其中，才能心无旁骛地为自己想想。

Watching the world instead of eating it up gives you the peace of mind to think for yourself.

youdao

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