flash and show a light

例句：

1. 1. The sun's rays are a constant source oflight and warmth.
   太阳的光线是持续的光和温暖来源。
2. 2. The flashlight illuminated the dark room.
   手电筒照亮了黑暗的房间。
3. 3. The flash of lightning acrossthe sky was breathtaking.
   天空中闪电的一闪而过令人惊叹。