超前钻孔是煤与瓦斯突出矿井中煤巷掘进工作面的局部防突措施之一。
Advancing hole is one of local prevent outburst measure at coal road heading face in coal-and-gas outburst mine.
重庆是全国有名的高瓦斯矿井和煤与瓦斯突出矿井集中的地区，瓦斯资源丰富。
A great many coal mines which are high coal bed methane content are concentrated in Zhohgqing areas.
重庆是全国有名的高瓦斯矿井和煤与瓦斯突出矿井集中的地区，瓦斯资源丰富。
A great many coal mines which are high coal bed methane content are concentrated in Zhohgqing areas. It is abundant in coal bed methane deposits.
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