lean clay

例句：

1. 1. The ancient pottery was made from the local lean clay.
   古代陶器是用当地的粘土制成的。
2. 2. The farmer used his shovel to dig up the lean clay for fertilizer.
   农民用他的铲子挖出粘土作为肥料。
3. 3. The construction crew carefully removed the lean clay from the foundation of the building.
   建筑工人小心翼翼地从建筑物的基础中移除了粘土。