hardpan /'hɑ:dpæn/ 📖 中文释义 n. 硬质地层, 未开垦的硬地, 粘土层 📘 English Definition(英文释义) n crust or layer of hard subsoil encrusted with calcium-carbonate occurring in arid or semiarid regions ← hardoon H 字母词表 hardpaste →