coal-sand dual media filter 煤砂双层滤料滤池
coal gangue sand 煤矸石砂
coal pillar for sand proof 防砂煤柱
non-coal molding sand 无煤粉型砂
Normally, silicon carbide is produced by heating sand (which is made of quartz, or silicon dioxide) in an electric furnace with carbon made from oil or coal.
通常，硅碳化合物通常由加热的沙子(通常由石英构成，或称二氧化硅)和石油或煤炭中提取的碳放在电气炉内反应而得到。
If you are in a hurry, you can pour water or sand over already cool coal to turn out any remaining fire.
如果你时间比较急，那么你可以倒一些水或者是沙子把火苗扑灭。
A coarse sieve used for sifting out fine particles, as of sand, gravel, or coal.
筛子：一种粗筛，用于筛选优良的东西，比如沙子、碎石或者煤。
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