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n.两面角，二面角
adj.二面的；有两个平面的
1、trihedral───adj.有三面的；[数]三面形的
2、decahedral───adj.十面体的；有十面的
3、cathedral───n.大教堂
4、anhedral───adj.他形的；下反角的；n.上反角；正上反角
5、dihedron───[数]二面体
6、trihedrals───adj.有三面的；[数]三面形的
7、-hedral───多面体
8、dihedrals───adj.二面的；有两个平面的；n.两面角，二面角
9、hemihedral───adj.（晶体）半面的，半面形的
1、Observers judged the magnitude of a concave dihedral angle translating or rotating against a planar background.───观察判断的幅度凹二面角翻译或对平面旋转背景。
2、The first task was to remove the old piton in the dihedral, essentially a piece of trash.───第一个目标就是清除在岩角上的旧岩钉，那已经是个垃圾了。
3、A rotation-invariant denoising algorithm is proposed for restoring noisy images with cyclic r and dihedral symmetries.───提出一种针对循环群和二面体群对称性图像的“旋转不变”去噪算法。
4、Open book - Same as a dihedral or inside corner. Two panes of rock join in an acute or obtuse corner that faces left or right.───两面角或者内角。两块岩石会聚成锐角或者钝角，向左或者向右。
5、Finally, structure of Lie superalgebra associated with dihedral group is discussed.───最后，讨论了与二面体群相伴的李超代数的结构。
6、As the chromophore relaxes, the twist of the C15 methine bridge about its two dihedral angles is reversed.───当发光基团松弛，C15次甲基桥的两个二面角的扭曲是相反的。
7、many helixes of dihedral Angle, and the whole skeleton forms a large helix in the structure of the rotatory isomer.───结构中包含许多二面角螺旋，而且具有旋光性的异构体，其结构的整体骨架也构成一个大的螺旋。
8、Combined with the equation of traveling wave and dihedral reflector, the RCS of total missile was calculated.───结合计算行波和二面角散射的经验公式，计算了DaoDan整体的RCS。
1、Discusses us by the electrochemistry to know that, the molecular structure (dihedral angle of biphenyl group) have the very heavy influence to the electrochemistry .
2、The dihedral corner reflector with wing and fuselage joint of aircraft is a very strong electromagnetic source in a wide angular range.
3、This is caused by the dihedral effect of the wings ( roll due to yaw ).
4、Variation of helices based on dihedral angels and residue composition.
5、The changes in dihedral of front wing and cathedral of rear wing have little effect on longitudinal aerodynamic characteristics but large effect on lateral-directional characteristics.
6、There is the larger dihedral angle between benzene ring and nitro group, which is the common experimental phenomenon and has been clarified with the electronic theory in this paper.
7、Finally, the RCS of a circle cylinder, a dihedral comer reflector and an S-shaped inlet is calculated, and the results demonstrate high accuracy of the proposed method.
8、Finally, structure of Lie superalgebra associated with dihedral group is discussed.
9、By the needing of cutting, the expression of dihedral angle, cutting angle and points in cutting trail can be given.