This is really a mental drill as much as a physicaldrill.
这是一个真正的精神钻一样多的身体钻。
2
The teacher taught us a freehand drill in the physical education class.
体育课上，老师教了我们一套徒手操。
3
Drill rig and its accessory tools were developed to meet the technical requirements of drilling Geo physical blast holes in soil and rock among mountainous and hilly area in China.