working of the cutting hole
working of the cutting hole
切割孔的工作
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The method of coal cutting adopts deep-hole blasting and realizes no people in the face, this decreases risk when workers are working in the face.
煤柱回收采用深孔爆破的方法落煤，减少工人在工作面打眼的危险。
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