the old sod

例句：

1. 1.The farmer was digging up the old sod to plant new crops.
   农民正在挖掘老地皮来种植新作物。
2. 2.The old sod had been replaced by a new lawn.
   旧地皮被新的草坪取代了。
3. 3.The old sod was too compact for the new garden design.
   旧地皮太紧实，不适合新的花园设计。