In order to obtain rust, brown, gun-black and ancient green films on brass at room temperature, the chemical coloring process on brass in acid solution was studied.

为了在黄铜基材上室温下获得铁锈色、棕色、枪黑色、仿古绿色膜层，研究了黄铜酸性化学着色工艺。

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Among other things, the gun Control Act of 1968 tried to restrict "Saturday Night Specials" -the cheap, easily available guns often used by urban (read, black) youth.

除此以外，《1968年枪支管制法》也试图对“周六晚间特别情况”做出限制，它们是城区(意为：黑人)青年通常不费周折就能得到的枪支。

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Officers from operation Trident — the Metropolitan Police unit that deals with gun crime in London's black communities — stopped the cab Duggan was travelling in during a pre-planned operation.

伦敦警察队负责调查黑人社区涉枪犯罪的三叉戟行动组当时拦截了马克·达根乘坐的出租车。

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President Barack Obama is rolling out the red carpet, complete with the full pomp of a 21-gun salute and a black-tie dinner after Oval Office talks on Wednesday.

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The dupes were light green and flimsy, the letters from that Gatling-gun typewriter of his black and distinct.

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