So, the principles that make respiration possible are relatively simple — diffusion and bulk flow.

因此，使呼吸成为可能的原理是相对简单的——扩散和容积运动。

Instead, you get all of your oxygen the way that your oldest, smallest evolutionary ancestors did — by simple diffusion.

取而代之的是，你会像你最古老、最小的进化祖先一样——通过简单的扩散来获得所有的氧气。

The bots were able to deliver their cargo to the right place in much less time than simple diffusion would allow.

机器人能够在比简单扩散所允许的时间短得多的时间内将货物运送到正确的地方。

That's why your respiratory system is the way it is: It's set up to take full advantage of both bulk flow and simple diffusion.

这就是为什么你的呼吸系统是这样的：它的设置充分利用了容积运动和简单扩散。

It's only by working together and using both the bulk flow and simple diffusion of oxygen that they can make possible the process of cellular respiration.

只有通过协同工作，同时利用容积运动和氧气的简单扩散，它们才能使细胞呼吸的过程成为可能。

And they did it through simple diffusion — when a material automatically flows from where it is concentrated, to where it is less concentrated, so it balances out.

它们通过简单的扩散实现了这一点——当一种物质自动从它集中的地方流向它不那么集中的地方，因此它获得了平衡。

But today you learned how it does work — including the mechanics of both simple diffusion and bulk flow, and the physiology of breathing, and the anatomy of the conducting zone, and the respiratory zone, of your respiratory system.

但是今天你们学到了它是如何工作的——包括简单扩散和整体流动的机制，呼吸的生理学，以及你呼吸系统的传导区和呼吸区的解剖学。