名词
中文翻译：煤层
同义词：
['coal reserves', 'coal seams']
例句：
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1.The mine produces a significant amount of coal every year.
这个矿井每年生产大量的煤炭。
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2. Coal is an important source of energy for many industries.
煤炭是许多行业的重要能源来源。
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3. The coal deposits are located in the northern part of the country.
这些煤矿位于该国北部。