单词：topsoils
n. the layer of soil on the surface
topsoil的用法和样例：
例句
- Heavy rains washed the topsoil away.大雨把表层土冲蚀掉了
- This topsoil tends to wash away.表层土壤要冲掉了。
词汇搭配
- topsoil planting表土栽植
- topsoil cover表土保护层
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