where they have to obey the laws of physics.

必须遵守物理法则的世界里发展壮大
It's interesting to try to understand this

探究这个问题很有趣
because if we understood sort of

因为如果我们能理解
how the human machine works,

人体这种机械如何运作
for example, under normal conditions you can think about,

比如正常情况下你会想
'How can I enhance performance in certain conditions?'

如何能在某些条件下增强自身的性能
That of course is a big part of exercise physiology is understanding

当然运动生理学很大程度上也是要弄清楚
how humans work as biomechanical machines.

人体是如何作为生物力学机械运作的
What we're going to talk about today with the example I want to use as

我们今天要通过几个例子来讨论这个问题
just an example of this is motion in biological systems.

我想用生物系统的运动方式作为例子
In particular, motion that humans can't do on their own,

尤其是人体所无法独自完成的运动
flying.

像飞翔