煤层对比correlation: n. 相互关系,相关(性);对比;交互作用;【数学】对射 ...coal seam: 煤层。 extract coal from seams: 从矿层中采煤gas-bearing coal seams: 煤系气coal seam correlation: 煤层对比下载手机词典可随时随地查词查翻译