trihedron
1. basic trihedron
基本三面体
2. irregular angle, right and reverse side, trihedron etc.
多角形、正反面、三面等。
3. moving trihedron
怜三面形
4. In this paper, unit moving trihedron is first constructed for a point on the surface of a revolution ellipsoid.
摘要以旋转椭球体面上某点为原点建立一个大地坐标单位活动坐标架。
5. rectilinear trihedron
直线三面体
6. associated trihedron
相伴三面体