directional hole meaning in English

定向井
定向孔
定向钻孔

Experimental research on the directional hole - forming and delivering explosion in long - borehole of top - coal
顶煤深孔快速定向成孔及输送炸药技术试验研究
During the detail construction , this paper emphasized the importance and seriousness of designing tracking . when construction of directional hole , according to the demand of designing tracking , we choose suitable directional drilling machine and control equipment and emphasized the importance of slop prepare during the back - dragging
在具体施工的过程中，本文强调了设计轨迹的重要性和严肃性，在施工定向轨迹时，一定要根据设计轨迹的要求，选择合适的定向钻机和导向设备，严格遵循设计轨迹进行施工，同时强调在回拖铺管过程中泥浆配备的重要性。