It indicates that the direction of ray axis and optical axis is identical by discussing the uniaxial crystal at last.
最后对一轴晶进行了讨论，结果表明此时光轴方向与光线轴方向一致。
In many instances the thickness of the optical axis direction of crystal as a important physical parameter needs to be confirmed, so it is necessary to accurately measure the crystal thickness.
在许多情况下，需要确定晶体光轴方向厚度这一重要的物理参数，为此就需要精确测量出晶体的厚度。
In many instances the thickness of the optical axis direction of crystal as a important physical parameter needs to be confirmed, so it is necessary to accurately measure the crystal thickness.
在许多情况下，需要确定晶体光轴方向厚度这一重要的物理参数，为此就需要精确测量出晶体的厚度。
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