1.
Students Understanging of Dihedral Angle and Dihedral Angle Plane Angle Concept;
中学生对二面角和二面角平面角的认知
2.
flat square
平面直角,[港]平面方角
3.
Gauss grid convergence
高斯平面子午线收敛角
4.
A rectangular parallelepiped.
长方体直角平行六面体
5.
To measure by using trigonometry.
用平面直角三角形计算工具测量
6.
The angular distance below the horizontal plane through the point of observation.
俯角从观察点看，在水平平面下的角距离
7.
(physics) the angle that a magnetic needle makes with the plane of the horizon.
（物理）磁针与地平线平面所形成的角。
8.
at right angles to the plane of the horizon or a base line.
与水平面或者基准面成直角。
9.
"Types of flat or angular moldings are the fascia, chamfer (or Bevel), and fillet (narrow Band)."
平面或角状线脚包括盘座面、斜切面(或斜角面)和方嵌条(窄带饰);
10.
A horizontal line or plane at right angles to the plumb.
水平线与铅锤线成直角的水平线或水平面
11.
a polyhedron whose vertices all lie in one or the other of two parallel planes; the faces that lie in those planes are the bases of the prismatoid.
顶点都在一个平面或两个平行的平面上的多面体；位于那些平面上的面是旁面三角台的底部。
12.
Discussing the Equation of Angle Bisection and Bisection Planes;
关于角平分线方程和二面角的平分面方程的探讨
13.
Some Geometric Inequalities on the Bisection Planes of the Dihedral Angles of a Tetrahedra;
关于四面体二面角平分面的几何不等式
14.
sweep optical square
平面扫描仪;扫描式光学直角头;扫描直角转光器
15.
The mean of angle of inclination in the palmar and ulnaris were respectively 4.5°,and 19.2°.
桡骨远端关节面掌倾角平均为4.5°,尺倾角为19.2°。
16.
The angle or inclination of a line or surface that meets another at any angle but90=.
斜角，斜面一直线或平面与另一（直线或平面）相交所成的除90°外的任意角或倾角
17.
The space between such lines or surfaces.
角度这样的线或平面之间的空间
18.
replace a corner by a plane, in geometry.
在几何中截去角使成平面。