boring operation meaning in English

钻探操作
镗孔操作

3 . 3 in particular , the potential hydrological problems caused by tunnel boring operation and portals construction may impose significant impacts on the underground hydrology of long valley
3 . 3钻挖隧道及兴建隧道口仍可能对?原地下水水文造成损害。
In particular , the potential hydrological problems caused by tunnel boring operation and portals construction may impose significant impacts on the underground hydrology of long valley
隧道的钻探工程及出入口建筑工程更可能产生水文问题，如导致地下水位产生变化，对?原的水文造成严重的影响。