In computer graphics and CAD, the clipping Windows researched up to now are all rectangular or polygonal. But in practice circular or elliptic clipping Windows are often used.
在计算机图形学及CAD中，到目前为止所研究的裁剪窗口都是矩形或多边形的，而在实际应用中经常要用到圆形或椭圆形裁剪窗口。
A milling method of curves in space is introduced in the paper, which can be applied to the processing of space circular, elliptic and other curves on various cylinders.
本文介绍了一种空间曲线轨迹的铣削加工方法，适用于加工各种圆柱面上的空间圆形、椭圆形，以及一些其它形式的曲线轨迹。
It has been pointed out that the elliptic locus of the major axis that is parallel to the shaker screen plan is better than the circular one.
指出，长轴平行于筛面的椭园运动轨迹，优于园形运动轨迹，因此，可以研制出更能满足净化泥浆要求的新型泥浆振动筛。
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