名词
中文翻译：中等厚度煤层
同义词：
['medium thickness coal seam', 'medium-thick coal seam']
例句：
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1. The mining company is looking for a medium-thickness coal seam to extract the valuable minerals.
该矿业公司正在寻找一个中等厚度的煤层来提取有价值的矿物。
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2. The construction of this new bridge will require the use of a medium-thickness coal seam.
这座新桥的建设将需要使用一个中等厚度的煤层。
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3.The coal seam has been mined out, leaving behind only the medium-thickness coal seam.
煤炭层已被开采，只剩下中等厚度的煤层。