A piece of sod has grass on the top and soil on the bottom.
一块儿草皮的顶部是草，底部是土壤。
It may also be responsible for sterilizing the red planet's top layers of soil.
这也是形成火星表层无菌土壤的原因。
Heavy rain can quickly wash away the rich top soil on flat, open land.
飘泼大雨能很快地冲走那里的平坦开阔的表层土壤。
The top soil has been washed away.
最上面的土壤已经补冲走了。
The top soil has been washed away.
最上面的土壤已经补冲走了。
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