因 与夹角 无关与一般光一样满足折射定律，故偏振方向为平行 称之为寻 常光 （O-ray）。而 是夹角 的函数因此不一定满足折射定律，故以平行长轴为偏振方向的光称为非寻 常光 （E-ray）。
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非常光线 Extraordinary ray ; extraordinary light ; extraordinary beam ; E-ray
寻常光线 [光] ordinary ray ; o-ray ; ordinary rays ; ordinary light ray
常常光顾一个地方 hang around
时常光临海滩 Visiting the shore occasionally
寻常光 [光] ordinary light ; ordinary ray ; o-ray
非常光 extraordinary ray ; extraordinary light
寻常光源 ordinary ight source
正常光谱 normal spectrum
异常光谱反射率 anomalous spectral reflectance
你可以有弱光，常光，亮光，闪光，但如果你持续没有光，那就什么也没有，这才叫黑暗，对吗？
You can have low light, normal light, bright light, flashing light, but if you have no light constantly you have nothing and it is called darkness, isn't it?
在横梁的上方，屋顶的表面覆盖着光伏组件，为展馆提供常所需的能量。
Above the beams the roof surface is covered with photovoltaic modules providing the Pavilion with the necessary daily energy.
目前常采用GS-DFB半导体激光器作为OTDM系统的光脉冲源，这种脉冲源产生的光脉冲一般较宽。
Nowadays, the optical pulse used in the OTDM system is often generated by the gain-switched distributed-feedback (GS-DFB) semiconductor laser, which has a large pulse width and negative chirp.
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