ray of light
光线
例句与用法：
Sight is made possible by rays of light impinging on the retina.
由于光线射到视网膜上,眼睛才看得见。
A process or state in which rays of light exhibit different properties in different directions, especially the state in which all the vibration takes place in one plane.
偏振(现象)光线在不同的方向上表现出不同特性的过程或状态，尤其是所有的振动都发生在一个平面的状态