1. To master drilling technique is very important to drilling workers. 掌握钻井技术对钻井工人是十分重要的。
2. A good way to help you to improve drilling technique is to use a jet bit. 能帮助你们改进钻井技术的一种好方法是使用喷射式钻头。
3. Helical flow in the annular is a common flow pattern in drilling, and it is an important engineering problem for fast and accurate calculating of the flow field and pressure gradient. 环空螺旋流是钻井液在钻井作业中常见的一种流型，怎样方便、快速及高精度地计算其流速场与压力梯度是一个重要工程问题。
英英解释
n.
1. the act of drilling
2. the act of drilling a hole in the earth in the hope of producing petroleum
