The surface soil and the unconsolidated mantle rock beneath it form only a thin venner . 地表土壤和它下面的未固结的风化层只是形成一个很薄的盖层。
In loessal regions and alluvial valley fills of the western united states, both surface soil and subsoil are commonly friable . 在美国西部黄土区和冲积河谷里,表土和底土一般是容易破碎的。
Early diagenesis in surface soil of yellow river delta 黄河三角洲表层土壤早期成岩作用初探
Standard practice for sampling surface soil for radionuclides 放射性核素表面土壤取样的标准实施规程
Further confusing the issue were high surface soil tests for k 表层土壤钾测试值高又进一步混淆了问题。