名词
中文翻译：煤炭
同义词：
['bituminous coal', 'anthracite coal']
例句：
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1.The mine produces a significant amount of coal every year.
这个矿每年生产大量的煤炭。
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2.Coal mining is a crucial industry in many countries.
煤炭开采是许多国家的重要行业。
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3. The coal mine has been closed due to safety concerns.
由于安全问题，煤矿已经关闭了。