名词
中文翻译：高级别煤炭
同义词：
['high-grade coal', 'premium coal']
例句：
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1. The high-rank coalmine is located in the northern part ofthe country.
这个高级别的煤矿位于该国北部。
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2. The high-rank coal is usedfor power generation and heating.
这种高级别的煤炭用于发电和供暖。
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3. Thehigh-rank coal hasa higher energy content than low-rank coal.
这种高级别的煤炭的能量含量比低级别的煤炭要高。