光源

例句：

1. 1. Thesun is the natural light source for ourplanet.
   太阳是我们星球的自然光源。
2. 2. The newLED bulbs are much more energy efficientthan traditional incandescent bulbs.
   新型LED灯泡比传统白炽灯更节能。
3. 3. The street lamps provide asoft glow to illuminate the night.
   街灯提供柔和的光亮，照亮夜晚。