大多数金属钻孔用的是麻花钻头。

Most drilling in metal is done with a twist drill.

youdao

钻头必须缓慢转动，以保证钻孔平整光滑。

The drill should be slowly rotated to ensure a clean hole.

youdao

这个钻头的位置和大小的文件描述每个钻孔。

The drill file describes the location and size of each drilled hole.

youdao

钻头上的控制钻孔机的圆形部分。

The machine used for drilling is called a drill press.

youdao

钻头上的控制钻孔机的圆形部分。

The machine used for drilling is called a drill press.

youdao