煤矿公司主要负责人说，一个新的通风井道被钻通，用以进行危险气体的进一步测验。
The chief executive of the mining company said a new shaft was being drilled to allow further tests for dangerous gases.
煤矿公司主要负责人说，一个新的通风井道被钻通，用以进行危险气体的进一步测验。
The chief executive of the mining company said a new shaft was being drilled to allow further tests for dangerous gases.
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