热光常数 thermo-optical constant
背光常亮 lights on
费尔德[磁旋光]常数 Verdet constant
键折光常数 bond refraction constant
非常光线 Extraordinary ray ; extraordinary light ; extraordinary beam ; E-ray
费尔德磁旋光常数 verdet constant
寻常光线 [光] ordinary ray ; o-ray ; ordinary rays ; ordinary light ray
光栅常数 [光] grating constant ; grating coefficient
光学常数 [光] optical constant ; Optics constant
屈光正常 [眼科] emmetropia
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.
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?
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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