名词
中文翻译：中等质量煤炭
同义词：
['average quality coal', "standard quality coal例句：1. The company's decision to invest in this medium grade coal project has been met with mixed reactions from investors.（该公司决定投资这个中等质量煤炭项目，投资者对此反应不一。）2. Due to the high demand for energy", 'medium grade coal is often used as a fuel source for power plants.（由于能源需求的高，中等质量煤炭经常被用作发电厂的燃料来源。）']
例句：
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1. The company's decision to invest in this medium grade coal project has been met with mixed reactions from investors.
该公司决定投资这个中等质量煤炭项目，投资者对此反应不一。
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2. Due to the high demand for energy, medium grade coal is often used as a fuel source for power plants.
由于能源需求的高，中等质量煤炭经常被用作发电厂的燃料来源。
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3.Coal mining companies are investing heavily in research and development to improve the quality of their medium grade coal.
煤矿公司正在大量投资研发以提高其中等质量煤炭的质量。