blast hole precharging

例句：

1. 1.The engineers were busy preparing the blast hole for the construction project.
   工程师们忙于为建设项目准备爆破孔。
2. 2. The precharged blast hole was used to create a large cavity in the rock.
   预充填的爆破孔被用来在岩石中创造一个大洞。
3. 3.The blast hole precharging process is crucial for the success of the mining operation.
   爆破孔预充填过程对于采矿作业的成功至关重要。