lignitous coal
英
美
网络 褐煤
双语例句
- Research of Reasonable Top Coal Thickness for Lignitous Coal Deposits in Dayan Mining Area
大雁矿区褐煤层综放开采合理顶煤厚度的研究 - Lignitous coal, humic acid, fragments of plant remnants and asphalt are main forms of existing organic substances.
褐煤、腐殖酸、残余植物碎屑和地沥青等是现存有机质的主要类型。