炮眼组 meaning in English

blasting round
drill round
round of holes

The rounds are definitely not particularly constricted except in the case of extremely narrow ore veins .
除了矿脉很狭窄，否则炮眼组肯定是不大受夹制的。
When a normal bench round is fired the general result is for the centre of gravity of the round to be moved forward .
起爆普通梯段炮眼组时，一般的结果是炮眼组的重心前移。
Full face round
全断面掘进炮眼组