怎样参数化空间上的椭圆曲线呢？

Yes? How do you parametrize an ellipse in space?

youdao

此参数的目的是改善性能并在用新分区键估算数据倾斜时最小化空间使用。

The purpose of this parameter is to improve performance and minimize the space usage when estimating data skew with new partitioning keys.

youdao

给定一个空间里的椭圆曲线，一个来参数化这曲线的有趣示例是,表示为圆柱体与斜面的相交部分。

Say that I give you an ellipse in space as maybe the more, well, one exciting way to parameterize an ellipse in space is maybe the intersection of a cylinder with a slanted plane.

youdao