松散煤层
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soft coal level
软煤水平
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Along with the mines toward deep level in China, the problems of soft rock are becoming more and more outstanding, especially controlling surrounding rock of three-soft coal seam.
随着我国煤矿开采越来越趋向深部，煤矿软岩问题便越来越突出，特别是三软煤层回采巷道的围岩控制问题。
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