underclay

underclay

美 　英

• n.【矿】底黏土
• 网络底粘土；底土

英汉解释

n.	1. 【矿】底黏土,煤屑底黏土层

英英解释

n.	1. a layer of fine-grained sedimentary clay found beneath a coal seam, containing the fossilized roots of the plants that became the coal