According to their developable characteristic, curved surfaces can be divided into developable and undevelopable ones.

按照它们的可展性质，曲面可以分为可展曲面和不可展曲面。

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The mathematical model of parallel and undevelopable ruled surface was constructed, the algorithm for NC ultrasonic grinding surface was founded.

建立平行、不可展直纹面数学模型，确定超声磨削加工平行、不可展直纹面时磨轮空间轨迹及其算法。

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There are many different methods to develop the same undevelopable curved surface, the criteria must be created to evaluate which one is the most appropriate.

对同一不可展曲面的展开可有多种近似展开方法，究竟哪种方法更为合理应建立相应的评判标准。

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"Across Scotland, we have an over-reliance on large strategic land releases but these are simply undevelopable because of the huge infrastructure costs associated with opening them up, " he said.

BBC: Slump in planning approvals for new Scottish homes

Tejon won the crucial backing of environmentalists in May 2008, when it agreed to put its 240, 000 undevelopable acres into a conservation land trust. (Tejon has retained the right to ranch, farm and prospect for oil on these lands and even sell large chunks, most likely to the environmentalists.) Full approval would enable Tejon to put up 26, 000 homes on the 30, 000 acres not included in the deal.

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