灰狗

例句：

1. 1. The gray dog was a loyal companion to the old man.
   这只灰色的狗是老人忠实的伴侣。
2. 2. The gray dog was a symbol of hope for the lost children.
   这只灰色的狗是失去孩子们希望的象征。
3. 3. The gray dog was a reminder of the hardships they had endured.
   这只灰色的狗是他们所经历艰难困苦的提醒。