a pool of water的用法和样例：
- The pot was sitting in a pool of water.
- A pool of water or mud where animals go to wallow.
- A stone dropped into a quiet pool of water.
- The corpse lay face down in a pool of blood.
- A youth who pined away in love for his own image in a pool of water and was transformed into the flower that bears his name.
- The fox lay dying in a pool of gore.