1.
Projective Theorem and Pythagoras s Theorem in Right-Angle Tetrahedron;
直角四面体中的射影定理与Pythagoras定理
2.
on Deviation Angle of Retlected Beam in Quasi-tetrahedroid Corner Cube Prism
准四面直角体棱镜出射线偏角的研究
3.
tetrahedral pentagonal dodecahedro
四面体式五角十二面体
4.
A rectangular parallelepiped.
长方体直角平行六面体
5.
a rectangular area surrounded on all sides by buildings.
四面都被建筑物所包围的四角都是直角的庭院。
6.
a tetrahedron with four equilateral triangular faces.
有四个等边三角形面的四面体。
7.
any object having a shape similar to a plane geometric figure with four equal sides and four right angles.
一个外形近似于平面几何中的正方形的物体，即有四个相同的边和四个直角。
8.
A DIRECT METHOD FOR SECTION DESIGN OF SQUARE COLUMNS CONSISTING OF FOUR EQUILATERAL STEEL ANGLE
等边角钢四肢方阵式格构柱截面直接设计法
9.
having four equal sides and four right angles or forming a right angle.
有四等边四直角的或构成一个直角。
10.
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
11.
Four Mechanisms Needed for Confronting Tour Guide Group Events
直面导游群体事件需要构建四个机制
12.
flat square
平面直角,[港]平面方角
13.
(geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon.
（几何）有四个相等的边和四个直角的平面长方形；有四个边的等边多角形。
14.
A plane figure consisting of four points, no three of which are collinear, connected by straight lines.
四边形，四角形由四个角组成的平面图形，没有任何三个点共线，通过直线相连接
15.
Four-sided faces only work well if the Face is pretty much flat (all points lie within one imaginary plane) and convex (the angle at no corner is greater than or equal to 180 degrees).
四边面只有在面是非常平整并且是直角的时候工作才是最好的（也就是四点处同一平面上）。
16.
A rectangle has four right angles.
一个矩形有四个直角。
17.
the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian.
天体的方位角是指包括它的垂直面与子午线平面之间的夹角。
18.
straddled double rear vault
分腿直角转体180°