基于晶体结构具有空间排列上的三维周期性，每个晶体品种都能为它自身提供一套天然合理的包含三个晶轴的晶轴系。
椭圆方位角-测量入射面和主晶轴之间的角度。
Azimuth, in Ellipsometry - the Angle measured between the plane of incidence and the major axis of the ellipse.
（结晶学）有三个以倾斜的角度交叉的不同晶轴。
The western tongue has a synclinal bottom configuration, the axis of which plunges at a low angle towards the fault.
(结晶学)有三个不同的晶轴，其中一个倾斜的交叉。
(crystallography) having three unequal crystal axes with one oblique intersection.
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