Well, for example,if our surface is a plane, a slanted plane given by some equation, ax by cz = d.

比如说，假如我们的曲面是一个平面，由公式ax+by+cz=d给出的，一个倾斜的平面。

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Now, thanks to a new collaboration with NASA, WorldWide Telescope has produced the most detailed spherical image of the heavens to date, along with a new 3-D, true color map of the surface of Mars.

现在，由于与美国航空航天局（NASA）的一项新合作，微软世界望远镜做出了迄今为止最详细的宇宙球面图，还有新的火星表面3D真彩地图。

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By analyzing the way each line rises and falls, the software builds a 3-d model of the surface of the finger in less than a second, with each ridge and valley in its proper place.

通过分析每个条纹升降的方式，系统软件在不到一秒的时间里就可构造出手指表面的三维模型，保证每个峰谷都处在各自合适的位置上。

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So, they developed this bifurcated tool, which would be appl--you'd put the stuff on the surface of the tool and then you'd scratch the skin in a certain way so that you could produce sort of a reproducible introduction of the vaccine into the skin.

所以他们发明了一种分为两叉的工具,把疫苗抹在这种工具表面上,然后以某种方式在皮肤上刮,这样就能将疫苗,重复不断地引入到皮下

耶鲁公开课 - 生物医学工程探索课程节选

They'd balance a spoon-shaped piece of magnetic rock on any flat surface, and since it was magnetic, the handle would swivel to align itself with the Earth's magnetic poles.

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But the profusion of ultra-specific real estate blogs that followed in Steele's wake show he'd only scratched the surface.

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