light emission

例句：

1. 1. The device emits a bright beam of light when turned on.
   当设备打开时，会发出一束明亮的光线。
2. 2. The scientist used a special lens to capture the light emission from the star.
   科学家使用一种特殊的透镜来捕捉恒星的光发射。
3. 3. The moon's light emission is responsible for the glowing effect during the night sky.
   月亮的光发射是夜晚天空发光的原因。