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。
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.
1635年，rifle作为英语单词出现在一条专利中。这是一条在枪膛中刻凿膛线的专利。
In 1635 the word rifle appeared in English in a patent for cutting these grooves in gun barrels.
法语单词rifler就曾经有“刮”(scratch)的意思，这也就解释了为什么枪膛内的膛线被称为rifling。
In French the word rifler meant to "scratch" and that's why the grooves inside a gun barrel are called rifling.
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