The Swede had discovered the rifling of his box.

瑞典人发现了他盒的膛。

When a bullet is fired through a gun, you know, the rifling in the barrel imparts marks to the bullet.

- 当通过枪发射时，你知道， 枪管中的膛痕迹。

But Rhodes was doubtless instrumental to the  defence of the town: he organized earthworks, water supplies, and even the production of a  rifled field-gun, nicknamed 'Long Cecil'.

但罗德斯无疑对保卫这座城市起到了关键作用：他组织了土木工程、供水，并甚至生产了一种带膛的野战炮，绰号为“长塞西尔”。