Original surface is formed from boundary curve and section curve using the redevelopement interface of UG.

初始曲面拟合是利用UG的二次开发功能，将截面线与边界曲线拟合成一张初始曲面。

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With mathematic analysis the end section curve of front blade of twist drills is induced into generalized involute;

通过数学分析将麻花钻前刃面端截面曲线归纳成广义渐开线；

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When the 8 bar mechanism turn into 9 bar mechanism, the variable section curve of the piston skirt can be formed by the 9 bar mechanism.

当把该八杆机构变成九杆机构时，该九杆机构可以成型活塞变截面曲线。

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Since small deviations are common and large ones are rare, the result of plotting data in this way is a curve shaped somewhat like the cross-section of a bell.

ECONOMIST: Climate change