There is a coal layer on the clay of direct roof.This layers is unstable and easy tofall down after mining and enable the gas to gush out.
团矿的直接顶板粘土之上有一煤,且不稳定,采后容易垮落,造成瓦。
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Rescue work continues, but has encountered difficulties after part of the coal mine tunnel collapsed.
救援在继续,但由于部分道出现垮落,救援十分艰巨。
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