To raise drilling performance of new micro-drill, a novel method was advanced for reginding of chisel edge.
为了提高新型微钻头的钻削性能，提出了一种适合于微钻头的横刃修磨原理及方法。
2
This means that to get water hot enough to raise steam, you have to drill down several kilometres.
这就意味着要得到足够热的水来使蒸汽上升，你就不得不把井向下挖掘几千米。
3
Taking use of the shock absorber, it can raise the service life for drill bit and drill tool, speed up drilling, get rid of drilling jumping, well protect surface equipments and drilling tools.