sinking barrel

例句：

1. 1.The old barrel was filled with water and sunk into the sand.
   那个旧桶被装满水，沉到了沙子里。
2. 2. The sailors were using a sinking barrel to collect rainwater for their fire.
   水手们正在使用一个下沉的桶来收集雨水作为他们的火源。
3. 3. The sinking barrel was a reminder of the dangers of unchecked exploration.
   那个下沉的桶提醒了人们，未经控制的探索会带来危险。