But then the crowd began cheering and putting flowers into the gun barrels of the tanks.

但是，很快人群开始欢呼，纷纷把花插在炮筒里。

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In 1635 the word rifle appeared in English in a patent for cutting these grooves in gun barrels.

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。

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Gun barrels spinning.

炮管旋转中。

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In 1914, in the run-up to war with Germany, a stainless-steel alloy developed to prevent corrosion in gun barrels went on sale in Sheffield, England.

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These sheriffs of Wall Street carve a notch on their gun barrels for the likes of Martha Stewart, Raj Rajaratnam, and their ilk.

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But the propellant that launches projectiles from gun barrels is not.

ECONOMIST: Ammunition depots