名词短语
中文翻译：煤化等级
同义词：
['coal rank', 'coalification rank']
例句：
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1.The rank of coalification is an important factor in determining the quality of the coal.
煤化等级是决定煤炭质量的重要因素。
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2.The rank of coalification can be used to predict the potential for oil and gas recovery.
煤化等级可以用来预测石油和天然气的回收潜力。
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3. The rank of coalification is determined by the amount of organic matter present in the coal.
煤化等级是由煤中的有机物质含量决定的。