upper soil layer

• 土壤表层

upper soil layer的用法和样例：

例句

1. The lithosphere is the soil mantle that wraps the core of the earth.
   岩石圈就是包裹在地核外的土壤表层。
2. Mulches prevent crusting of the soil surface, thus improving the absorption and movement of water into the soil.
   覆盖物可以防治土壤表层板结，使水份容易被土壤吸收。