Fluid mechanics is the description of the flow of liquids and gasses.

流是液和气流动的描述。

Fluid mechanics is notoriously difficult, mostly because motions of tiny things like molecules get really complicated really fast.

流是出了名的困难，主要是因为分子等微小物的运动很快就会变得非常复杂。

Using fluid mechanics you can work out how much lift is generated from an aeroplane's wing, or how aerodynamic a car is.

用流，您可以计算出飞机机翼产生了多少升，或者汽车的空气动特性如何。

[Derek] For fluid mechanics, I always expect that you have to keep the Reynolds number the same as in the real world phenomena.

- [Derek] 流，我总是希望你必须保持雷诺数与现实世界现象相同。

So the work that we do is combining fluid mechanics with problems that are relevant in health and epidemiology to understand better how pathogens are transmitted.

因此，我们所做的工作是将流与健康和流行病相关的问题结合起来，以更好地了解病原的传播方式。

Today, I'm going to tell you a story about one of nature's most extraordinary engineers that pushes the limits of fluid mechanics and bioengineering and arguably solves their No.

今天，我将向您讲述一个关自然界最杰出的工程师之一的故事，他突破了流和生物工程的极限，并可以说解决了他们的第一大难题。