名词
中文翻译：无烟煤
同义词：
['bituminous coal', 'lignite']
例句：
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1.The nonbaking coal mine is located in the remote mountainous area.
这个无烟煤矿位于偏远的山区。
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2. The bituminous coal is used for heating and cooking.
这种烟煤用于取暖和烹饪。
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3.Lignite is a type of coal that is softer and easier to work with.
褐煤是一种更软、更容易加工的煤炭类型。