slow-helix straight shank drill是什么意思

用法例句

The bionics theory was applied on the spiral bits,and then a non-smooth spiral bit was designed and processed for carried out the problem of serious sticking.

将仿生非光滑理论应用于螺旋钻头设计上,以解决粘性土钻进中螺旋钻头阻力大、粘附严重的难题。