抛物面一种有与单坐标轴平行的抛物截面和与该轴垂直的椭圆截面的平面。
A surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis.
但是，开发商和设备制造商面正在遭遇新的挑战，包括精确地确定人所处的实际位置，把坐标成有意义的信息，保护用户的隐私等。
But developers and device makers face new challenges that include determining physical location accurately, turning coordinates into meaningful information, and protecting users' privacy.
本文详细研究了不同旋向楔横轧成形螺旋面在不同坐标下的方程。
The equations of different helix in cross wedge rolling in different coordinates were studied in this paper.
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