开灯

• to light
• to light a room

例句

1. 咱们开灯吧。
   Let's put on the light.
2. 由于光速极快，我们几乎能在开灯的那一瞬间就看见电灯亮起来。
   Because of the great speed of light, we see a lamp light up almost at the exact moment we turn it on.
3. 他打开水龙头[开灯，放上洗澡水]。
   He turned on the tap [light, his bath water].