1. 煤层：coal sampling 煤炭取样 | coal seam 煤层 | coal separator 选煤机
2. 煤层(炭层)：煤层;炭层 coal bed | 煤层(炭层) coal-seam | 煤底土 coal seat
3. 厚煤層：Pest有害的動物,害蟲;有害的植物 | Coal seam厚煤層 | individuals matter個體問題
1. The scarce resources of the coal seam need to be finely and carefully mined, the company said.
2. Henan Coal Seam Gas will search for shale gas at the Xiushan block.
3. coal seam在线翻译
3. Origin's board rejected the previous agreed offer after doubling its coal seam gas reserves.
4. He said loose coal was definitely burning and possibly the coal seam near the bottom of the pit.