名词
中文翻译：煤炭层
同义词：
['coal seam', 'coal bed', 'coal stratum']
例句：
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1. The coal layer is thick enough to support the weight of heavy machinery.
煤层足够厚，可以支撑重型机械的重量。
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2. The mining company has been extracting coal from this area for decades.
这家矿业公司几十年来一直在这个地区开采煤炭。
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3. The coal layer is a valuable resource that can be used for energy production.
煤层是一种宝贵的资源，可以用来生产能源。