topsoil

表层土；上层土英释中释nthe upper level of soil in which most plants have their roots

1 Stone is the foundation, above which is soil, and then topsoil..石头是基础，上面是泥土，再上面是表土。

2 After shoveling out the topsoil, Garfinkel uncovered coins and other artifacts from the time of Alexander the Great..在铲去了表层土以后，加芬克尔发现了来自亚历山大大帝时期的硬币和其他人工制品。