drillstring的用法和樣例：
例句
- The contact between drillstring and bore hole wall in the process of horizontal drilling is of large area and geometrically nonlinear.
長中半徑水平井鑽柱與井壁的接觸問題是大面積接觸的幾何非線性問題。 - A transmitter toroid induces a low-frequency current in the drillstring, which flows out of the bit and returns farther up the string.
發射線圈在鑽柱內感應出低頻電流，從鑽頭流出，在鑽柱上部返回。
