brighten function

例句：

1. 1. The room was dimly lit by the single light bulb.
   房间由唯一的灯泡微弱地照亮。
2. 2. The sun's rays brightened the landscape as itrose over the horizon.
   太阳的光线在地平线上升起时，给风景增添了一抹亮色。
3. 3. The teacher brightened the classwith her engaging lectures.
   老师用她引人入胜的演讲让全班同学都精神焕发。