名词
中文翻译：无烟煤
同义词：
['bituminous coal', 'anthracite coal']
例句：
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1. The paranthracite mineis located in the heart of the city.
这个无烟煤矿位于市中心。
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2. The paranthracite was used to produce high-quality steel.
这种无烟煤被用来生产高质量的钢材。
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3. The paranthracite wasmined for centuries before it was discoveredby scientists.
这种无烟煤在被发现之前已经被开采了数百年。