| 单词 | coal seam |
| 释义 | coal seam (once / 48046 pages) n WORD FAMILY coal seam: coal seams USAGE EXAMPLESGas explosions inside mines are often caused when a flame or electrical spark ignites gas leaking from the coal seam. Time(Oct 31, 2016) UCG is a method of extracting gas from coal seams that are too deep underground to be mined using traditional techniques. BBC(Oct 05, 2016) This is the miners’ 45-minute commute to the coal seam, where they shave off thousands of tons of black rock each week. New York Times(Oct 01, 2016) n a seam of coal Hyper bed, seam a stratum of ore or coal thick enough to be mined with profit |
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