名词
中文翻译：煤层
同义词：
['coal seam', 'coal stratum', 'coal layer']
例句：
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1.The coal mine is located at the top of the mountain, just a few kilometers away from the city.
煤矿位于山顶，距离城市仅几公里。
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2. The coal industry plays an important role in the country's economy.
煤炭产业在国家经济中扮演着重要角色。
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3. The coal mining company has been working on improving its safety measures for years.
这家煤炭开采公司多年来一直在努力提高其安全措施。