drilling string

例句：

1. 1. The engineer used a drilling string to bore through the rock.
   工程师使用钻杆钻穿岩石。
2. 2.The drilling string was essential for the successful completion of the project.
   钻杆对于项目的成功完成至关重要。
3. 3. The drilling string was exposed to high temperatures and pressures during the drilling process.
   在钻孔过程中，钻杆暴露于高温和高压之下。