他说，五月份矿工们很沮丧地发现，有59头骡子在没有通风的矿井里死了。
In may, he said, miners were dismayed to discover that 59 mules had died from unventilated mine gas.
营救人员向矿井挖了第三个孔，但是却无法将摄像头降下洞中。
Rescuers bored a third hole into a chamber, but weren't able to lower a microphone into the space.
利用瞬变电磁法在煤矿井下独头巷道开展了超前探测含水构造的试验研究。
It is researched that the bore-hole transient electromagnetic method is applied to detect the water-bearing structures in advanced face of underground coal mines.
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