来自《耶鲁大学开放课程：生物医学工程探索 第19集 第19集》
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how the physical structure of animals关于动物身体的结构 -
is adapted to their function是如何与其功能相适应的例子 -
and a lot of it is their function as mechanical objects.其中很多作用原理与机械物体相同 -
It's a familiar concept我们很熟悉这些概念 -
but one can sort of break it apart.但我们可以把它们拆开来看 -
An interesting kind of bird is shown here, a hummingbird;这里有一种很有趣的鸟 蜂鸟 -
have you ever watched a hummingbird?你们见过蜂鸟么 -
Hummingbirds do something that's really amazing,蜂鸟的一些能力非常令人惊讶 -
they hover, which means they can stay up in the air它们能悬停 也就是说它们能在空中停留 -
without having any forward thrust.而不受任何前推力 -
When I was talking about the airplane example当我在讨论飞机的例子时 -
or even the bird example,甚至是鸟类的例子时