hard coal [矿物] 硬煤 ; 无烟煤 ; 白煤 ; 其中
medium hard coal 中等硬度煤
dull hard coal 无烟煤 ; 暗硬煤
hard-coal plough [矿业] 硬煤层刨煤机
Hard coal and coke 硬煤和焦炭 ; 无烟煤和焦炭
Preparation of hard coal 选煤 ; 无烟煤制备 ; 选煤准则
HARD COAL COKE 碳煤焦炭
hard coal seam 硬煤层
hard coal level 煤层硬
The miserable Toad, crouching in the coal-dust, tried hard to think of something to do, with dismal want of success.
可怜的托德蜷缩在煤尘里，拼命想主意，可是苦于想不出来。
It may be hard to imagine a planet blacker than coal, but that's what astronomers say they've discovered in our home galaxy with NASA's Kepler space telescope.
很难想象一个行星比煤炭还要黑，但是宇航员们的确声称，他们通过NASA的开普勒太空望远镜在我们所处的银河系发现了这样一颗行星。
Planning aside, nuclear plants can be hard to finance, since they cost more and take longer to build than coal - or gas-fired units.
撇开规划不说，相比用煤或煤气作燃料，核电站成本更高，建设周期更长，因而资金筹措也相当困难。
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