n. 表层土 v. 去掉表土 精选例句 高考 1、 Many farmers use good conservation practices,and the state’s rich topsoil in many areas is deep enough to last decades with moderate amounts of erosion. 很多农民采用较好的保护土地的措施，并且爱荷华州广袤而丰饶的表层土的深度足以持续数十年适度的大量土地侵蚀。 来源: