grayer

例句：

1. 1. The sky turned grayer as the storm approached.
   暴风雨来临前，天空变得更灰暗。
2. 2. She wore a grayer dress than usual for the occasion.
   她为了这个场合穿着一件比平时更灰暗的裙子。
3. 3. The room was grayer than before, and it felt gloomy.
   房间比以前更阴暗，感觉很阴郁。