mantle rock

• 风化层

mantle rock的用法和样例：

例句

1. 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。
2. The surface is the relatively thin covering of soil and unconsolidated rock waste.
   浮土是由土壤和未固结岩屑组成的比较薄的覆盖层。