The extraction of feature lines for shoe instep surface curve was realized by joint-type measurement arm in Coordinate measurement in shoe instep.

鞋楦坐标测量采用关节式测量手臂实现鞋楦曲面特征线的提取。

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The qualitative analysis and quantitative calculation about water surface curve is one of problems on non-uniform flow in water conservancy works.

水利工程中提出的非均匀流问题之一，是关于水面曲线的定性分析和定量计算。

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However, the unstable flow is usually considered as stable flow in the calculation of natural river water surface curve in order to minimize the calculation work.

但在天然河道水面线计算中，为了节省工作量把不恒定流视为恒定流。

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In addition to mastery of traditional calligraphy, the art of engraving requires a high degree of virtuosity, since the artist works on a tiny surface area where every curve, every thickness of line counts.

UNESCO: Culture

While the screen's surface is completely flat, the edges curve around gently, forming a rounded back.

ENGADGET: Nokia Lumia 620 review: precisely what an entry-level smartphone should be

In the past a product's shape alterations would be hammered out by designers in a surface-modeling program, a tool that allows for easy curve design and concept change.

FORBES: Easy Designer