1·The introduction of rifling, or cutting grooves, into a barrel had already improved accuracy, but the weapons remained difficult to load and clean.
人们将来复线（膛线）引入枪管之后提高了射击的精确度。 但是装弹和清膛仍然很麻烦。
2·On its way, the iron bullet expanded, gripping the spiral rifling and spinning so tightly along its course that its range and accuracy were greatly increased, with fewer misfires.
弹头（在枪膛中）的前进过程中，铁制子弹（此处指底座上的铁质闭锁，也有使用软木制作闭锁的——译注）会膨胀，紧咬住螺旋形的膛线，使得射程和精准度都大大增加，同时减少子弹死火。
3·Correction for drift caused by the adoption of rifling in big guns was approximated by inclination of the rear sight bracket.
并且靠稍微偏移后瞄准座来修正大型火炮因膛线所带来的偏流。
4·It was rare, she said, rifling through a patient's tattered record.
这是少有的，她说，通过病人的破烂的纪录膛线。
5·A New Method for Measuring the Rifling Angle of Artillery Pipe Based on Template Matching.
基于模板匹配的火炮身管膛线缠角测量技术研究。