a clod of earth的用法和样例：
- She picked up a clod of earth on the mountain, and insisted it was a treasure.
- The boat came nearer, and when it was about three or four yards away Chang Su-su picked up a clod of earth and threw it at the boat.
- To break up(clods of earth)with a harrow.
- To break up(clods of earth) with a harrow.
- A heavy harrow for breaking clods of earth.