短語(yǔ)詞組短語(yǔ)lake chalk raw soil 湖積白堊粗質(zhì)土chalk humus soil 白堊腐殖土chalk k soil 白堊土basal surface chalk soil 風(fēng)化麪白堊土limestone weathering crust chalk soil 灰?guī)r風(fēng)化殼白堊土 返回 chalk soil