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來復線

膛線。來復為英語rifle的音譯。槍炮膛內螺旋形的凹凸槽紋，凹者稱為「陰來復線」，凸者稱為「陽來復線」。發射的彈頭循來復線擠壓射出後，作旋轉前進以維持固定方向，使能準確射擊。也譯作「來福線」。

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