To resolve the difficulty of progressive time calculating in normal inverse-time overcurrent curve, two algorithms of zonal table-lookup and Taylor expansion are put forward.

然后针对计算比较困难的一般反时限曲线，介绍了分区查表和泰勒展开法计算时延累加量的算法。

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As a result, the limit surface of the polygonal mesh containing the symmetric zonal meshes is the subdivision surface satisfying the curve interpolation constrains.

因此，含有这种对称网格带的多面体网格的细分极限曲面即为满足曲线插值约束的细分曲面。

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The zonal distribution of precipitation is two peak value curve tendency in low latitude region and up tendency in middle latitude region and down-up tendency in high latitude region.

各区域年降水量的经向廓线表明：低纬、中纬、高纬地区年降水量的纬向廓线一样呈“东多西少”的形势，高纬地区呈“下降一上升”的分布型不同于低、中纬地区及中国区域。

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