光轴的英文：
ray axis
optic axis
optical axis
principal axis
Crystals of this type, having only one optic axis, are called uniaxial crystals.
这种只有一根光轴的晶体称为单轴晶体。
n. 射线；光线；一线；鳐
v. 放射，辐射；照射；闪现
Bear in mind that the chief ray is now principal ray.
记住，此时主光线就是主点光线。
externo-lateral ray
外侧辐肋
concrete for radioactive ray shielding
放射线屏蔽用混凝土
n. 轴，光轴，核心，轴心国
transverse axis
【数】横截轴
three-axis trainer
三自由度练习器
Next to or facing the main stem or axis.
近茎轴一侧的紧挨着主茎或轴的，面向主茎或轴的
adj. 眼睛的，视觉的；光学的
Optical brightener(Optical brightness agent): Synonymous with Optical bleaching agent.
光学增光剂:即光学漂白剂。
Optical depth and optical path are often confused in the literature.
文献中光学厚度和光程时常混淆。
A computer that is made of optical fiber and various optical elements
一种利用传递光信号的光纤与各种光学元件相结合而制成的计算机。