极薄煤层
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extremely thin coal bed
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Regarding the extremely thin coal bed coal and the gas prominentpossibility analysis, in formerly practiced was a blank, therefore inthe production process knew and took the degree to be insufficient.
对于极薄煤层煤与瓦斯的突出可能性分析，在以往实践中是个空白，所以在生产过程中认识和重视程度不够。
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