名词
中文翻译：自由煤
同义词：
['unconfined coal', 'freestone coal']
例句：
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1. Themine is producing a significant amount of freecoal.
该矿正在生产大量的自由煤。
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2.Free coal is often used in power plantsto generate electricity.
自由煤通常用于发电厂发电。
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3. The company has been using freecoal to reduce its carbon emissions.
该公司一直在使用自由煤来减少其碳排放。