drill collar stiffness

例句：

1. 1.The drill collar stiffness is an important factor in determining the accuracy of the drilling process.
   钻套筒的刚度是决定钻孔过程精度的重要因素。
2. 2. The engineer carefully measured the drill collar stiffness to ensure that it meets the required standards.
   工程师仔细测量了钻套筒的刚度，以确保其符合要求。
3. 3. Due to the high drill collar stiffness, the drilling operation was slow and laborious.
   由于钻套筒的刚度很高，钻孔作业缓慢且费力。