名词
中文翻译：腐植质煤
同义词：
['humic coal', 'humus coal']
例句：
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1.The sapropelic coal is a valuable resource for the local economy.
腐植质煤是当地经济的重要资源。
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2. The sapropelic coal has been used in various industries for centuries.
腐植质煤在几个世纪以来被用于各种工业。
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3. The sapropelic coal is rich in nutrients and can be used as fertilizer.
腐植质煤富含养分，可以用作肥料。