变灰色

例句：

1. 1. The sky turned a deep gray as the storm approached.
   暴风雨来临前，天空变成了深灰色。
2. 2. His clothes were covered in a layer of dust, giving them a dull gray hue.
   他的衣物上覆盖着一层灰尘，显得暗淡无光。
3. 3. The old building was painted a dull gray, blending into the surroundings.
   这座旧建筑被刷成了暗淡的灰色，与周围环境融为一体。