hard-rock boring

例句：

1. 1. The engineers are hard at work on the new hard-rock mining project.
   工程师们正忙于新硬岩采矿项目的建设。
2. 2. The geologists are conducting a hard-rock boring to explore the underground caverns.
   地质学家正在进行硬岩钻孔以探索地下洞穴。
3. 3. The construction company is using advanced equipment for the hard-rock boring process.
   建筑公司正在使用先进的设备进行硬岩钻孔过程。