Most coal mines are buried deep underground.
大多数煤矿都是深埋地下的。
The extraction of coal from these deep mines is expensive.
从这些深矿中取得煤是很昂贵的。
It is an exigent problem to solve the dry deep screening of moist fine coal.
潮湿细粒煤炭干法深度筛分是筛分技术急需解决的问题。
It is an exigent problem to solve the dry deep screening of moist fine coal.
潮湿细粒煤炭干法深度筛分是筛分技术急需解决的问题。
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