名词
中文翻译：煤炭
同义词：
['coal', 'bituminous coal', 'lignite例句：1. The mine produces a significant amount of hercoal every year.（这个矿井每年生产大量的煤炭。）2. Coal is an important source of energy for many countries.（煤炭是许多国家的重要能源来源。）']
例句：
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1. The mine produces a significant amount of hercoal every year.
这个矿井每年生产大量的煤炭。
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2. Coal is an important source of energy for many countries.
煤炭是许多国家的重要能源来源。
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3. The company plans to invest in new hercoal mining projects.
该公司计划投资新的煤炭开采项目。