coal指煤的时候不可数；指煤块（尤其是燃烧着的煤块）时可数。
coaln.煤；(尤指燃烧着的)煤块；vt.上煤；加煤给…加煤
Coal is to be displaced by natural gas and nuclear power.
煤炭将让位于天然气和核能。
The company, New England Electric, burns coal to generate power.
新英格兰电力公司用煤发电。
In two years, the British coal industry will be dead and buried.
英国煤炭工业只消两年就将彻底瓦解。
