File off both bores to the hexagon of the insertion bushing using a needle-point file.
用细锉将两个孔锉成镶入衬套的六边形。
2
On the point of an upright needle he laid horizontally a fine steel bar, which could turn to the right and left like the magnetic needle in a compass-box..
他在一根垂直的针头顶点，设置了一根水平的钢制细棍，它可以左右转动，就像罗盘里的磁针那样。
3
In the study, however, a standard map was used so that the needle insertion point was the same for every patient.