For better manifestation of colours in anisotropic transparent stones the orientation of faceting along opticalaxes is necessary.
要使非均质性透明宝石矿物的颜色更好地表现出来，沿光轴方向的加工定向是非常必要的。
2
It adopted two CCD cameras distributing in both sides of the measured volume and their opticalaxes being vertical with each other.
采用两个光轴相互垂直的CCD摄像机，分布在测量腔体的左右两侧。
3
The main light-emitting diodes are fixed to the light body in such a way that the opticalaxes thereof cross the light axis in the center of a light spot.