柯林斯词典topsoil /ˈtɒpˌsɔɪl/ 1. N-UNCOUNT Topsoil is the layer of soil nearest the surface of the ground. 頂層土 返回 topsoil剑桥词典(the soil which forms ) the top layer of ground in which plants grow 表土（層） 比較subsoil 返回 topsoil