灰色物

例句：

1. 1. The gray matter in the brain is responsible for processing information.
   大脑中的灰质负责处理信息。
2. 2. The gray clouds were a sign of impending rain.
   灰云预示着即将下雨。
3. 3. The gray coat was worn by an old man who had lived through many years.
   这件灰色外套是那位历经多年沧桑的老人所穿。