这节课的重点是制作风筝；风筝是如何制作的，它们的外观和用途。

The focus of this lecture is kite making; how the kites were made, their appearance and the purposes they served.

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例如，许多农村租户仍然拥有“estoyers”权，即砍下蕨类植物作为牲畜的床上用品和用途的权利。

For example, many rural tenants still have the right of "estoyers", the right to cut bracken as bedding for livestock and uses.

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我们可以看到，在自然界中，颜色可能有许多不同的存在原因和用途。

We can see that there may be many different reasons and uses for colors in the natural world.

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So you build it with a material like silver and gold, and then you encounter the problems of society that your bridge might get stolen because somebody thinks they have a better use for silver and gold than your bridge.

但如果你用金或银这样的材料,你又会面对新的问题,你的桥会被偷走,因为有人认为金和银有比造桥更好的用途

耶鲁公开课 - 生物医学工程探索课程节选