煤炭（coal）通常为不可数名词,但作“一块儿煤”或“打碎了的煤”“燃烧的煤块儿”等解时可用作可数名词,能和不定冠词连用,也可使用复数形式。
单词例句：
用作名词 (n.)
He put a shovel of coal on to the fire. 他往火炉里加了一铲煤。
The country is rich in oil and coal. 这个国家石油和煤的资源丰富。
Coal can be converted to gas. 煤可以转化成煤气。
I'm in charge of discharging a large amount of charcoal and coal at the coal mine. 我负责在煤矿卸一大堆木炭和煤。
用作及物动词 (vt.)
The workers were coaling the ship when he came back. 当他回来的时候,工人们正在给船加煤。
用作不及物动词 (vi.)
The ship called at Boston to coal. 船停靠在波士顿加煤。
The big ship coaled. 这艘大船是用来装煤的。
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