本文讨论了三维空间中到两定直线的距离之比为常数的点的轨迹。
This paper discusses the loci of moving points with constant ratios of distances from two fixed lines.
利用二次曲面的不变量判定到一定点和一定平面(定直线)的距离之比为常数的空间点的轨迹。
Make use of constant measure of second order curved face, and judge the space figure that arrive the fixed point and the fixed flat surface (fixed straight line) distance's ratio is a constant.
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