N a drill bit having two helical grooves running from the point along the shank to clear swarf and cuttings 螺旋钻
Most drilling in metal is done with a twist drill.
大多数金属钻孔用的是麻花钻头。
The twist drill may be divided into three principal parts:shank, body and point.
麻花钻也许可以被划分成三个主要的部分：钻柄、钻体和钻尖。
How to machine twist drill high efficiently and high precisely is a problem to discuss.
如何高效、高精度地加工出合格的麻花钻一直是在探讨的问题。
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