名词
中文翻译：煤炭
同义词：
['coal', 'bituminous coal', 'anthracite coal']
例句：
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1. The mine produces a lot of coal for the factory.
这个矿井为工厂生产了大量的煤炭。
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2. Coal is an important source of energy in many countries.
煤炭是许多国家的重要能源来源。
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3. The coal mine is located in the mountains, far from the city.
煤矿位于山区，远离城市。