deep drilling

• 深孔钻眼,深钻,深孔钻探

deep drilling的用法和样例：

例句

1. Instead of bulldozing off the clay and exposing the rock, drilling was carried out through the clay and the rock by the use of special equipment.
   在这里使用特殊设备穿入土层和基岩中进行钻眼，以取代常规的清除掉淤泥层使基岩外露的施工方法。