The surface theory in the space form, especially, the construction and the classification of a special surface is an important and interesting problem.

空间形式上的曲面论，尤其是对某一特殊曲面的构造和分类是微分几何中的一个重要而有趣的课题。

youdao

According to surface theory in differential geometry, the two-dimensional surface is parameterized by two variables.

微分几何中的曲面论，用两个变量就可以完全参数化一个二维曲面。

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A new method based on lifting-surface theory is presented determining the load distributions on finite wings in subsonic flows.

本文提供了亚音速升力面理论的一种新解法，可求解亚音速流中有限翼展机翼的载荷分布。

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One argument against the comet theory is that a comet would have left a large hole in the Earth's surface.

VOA: special.2009.01.20

In it,he developed a theory that intelligent life had created waterways all over the surface of Mars.

VOA: special.2010.07.11

According to tectonic theory, the surface of the Earth is made up of a patchwork of massive rigid plates, about 80km (50 miles) thick, which float in slow motion on top of the Earth's hot, pliable interior.

BBC: The Pacific 'Ring of Fire'

This is the theory that life is not merely a surface scum which clings to the outside of planet Earth, but that living things, in the form of so-called extremophile bacteria which can tolerate infernal heat, penetrate several kilometres into the planet's interior.

ECONOMIST: Obituary

One theory is that the summer sun melts ice on the surface of the glacier which creates pools of water which then flow into moulins -- narrow tubular shafts in the glacier.

CNN: Rubber ducks aid NASA study