coal mining

• 煤矿开采

coal mining的用法和样例：

例句

1. The utilization of CMM drained in coal mining is quite difficult because it contains plenty of air.
   煤矿开采时所抽采的含空气的煤层气难以得到很好的利用。
2. With the increase of the depth of coal seams mined, rock bursts will easily occur in gateways with fully-mechanized sublevel caving mining.
   摘要随着煤矿开采深度增加，综放开采回采巷道易发生冲击地压危害。
3. Coal mining has always been a dangerous occupation.
   采煤向来是一种危险职业。
4. We have raised the coal output by using better mining methods.
   我们利用更好的采煤法增加了煤炭产量。