名词
中文翻译：Unknown
同义词：
['煤层结构，煤层类型例句：1. The formation of the coal seam is complex and requires careful analysis.（煤层的形成过程复杂，需要仔细分析。）']
例句：
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1. The formation of the coal seam is complex and requires careful analysis.
煤层的形成过程复杂，需要仔细分析。
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2.The study of coal seams is essential for understanding the geological history of the region.
研究煤层对于理解该地区的地质历史至关重要。
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3. The extraction of coal from the seam requires advanced mining technology.
从煤层中提取煤炭需要先进的采矿技术。