Heavy rain can quickly wash away the rich top soil on flat, open land. 飘泼大雨能很快地冲走那里的平坦开阔的表层土壤。
Topsoil from different soil types shall be stockpiled separately and replaced in the same areas from which they were taken. 不同类型的表层土壤应分开储存，更换时也应置放于取土的同一区域。
英汉词典
