时差N小时 可乐除铁锈（下）

Acids, like the weak acid present in your can of Coke, can react with oxides to effectively reverse the process of tarnishing².

而酸，比如可乐中的弱酸，和氧化物产生化学反应，能有效避免生锈。

The acid dissolves the metal oxides that make the tarnish¹, leaving only shiny metal behind.

酸可以分解金属氧化物，化学反应后的金属锃亮。

You can try this at home, even if you don't have a brass³ candle stick.

即便家里没有铜烛台，你可以做这样的试验：

Leave a tarnished⁴ old penny in a glass of cola overnight.

晚上，将一枚旧硬币丢进装有可乐的杯里。

In the morning it will be shiny and fresh.

第二天早上，硬币就变得闪亮如新。

If the acid in cola is so good at attacking tarnished metal, what might it do to your insides?

如果可乐能有效清洁金属锈斑，那么可乐对人体的内脏会产生什么影响呢?

Actually, your stomach already contains its own supply of acid which it uses to digest food.

事实上，人体的胃里就有分泌的酸液来消化食物。

This stomach acid is a great deal stronger than the acid in a can of Coke.

胃酸的酸性比一听可乐还强。

Indeed, stomach acid would be an even better tarnish remover than cola!

说真的，胃酸甚至比可乐更能除锈。

1 tarnish   

n.晦暗，污点；vt.使失去光泽；玷污

参考例句：

• The affair could tarnish the reputation of the prime minister.这一事件可能有损首相的名誉。
• Stainless steel products won't tarnish.不锈钢产品不会失去光泽。

2 tarnishing   

（印花）白地沾色

参考例句：

• The causes of tarnishing gold and silver-plated connectors were studied respectively. 分别探讨了接插件镀金和镀银层变色的原因。
• Bright tin electrodeposits on copper wire are susceptible to tarnishing. 铜线材经光亮镀锡后易产生腐蚀变色。

3 brass   

n.黄铜；黄铜器，铜管乐器

参考例句：

• Many of the workers play in the factory's brass band.许多工人都在工厂铜管乐队中演奏。
• Brass is formed by the fusion of copper and zinc.黄铜是通过铜和锌的熔合而成的。

4 tarnished   

（通常指金属）（使）失去光泽，（使）变灰暗( tarnish的过去式和过去分词 )； 玷污，败坏

参考例句：

• The mirrors had tarnished with age. 这些镜子因年深日久而照影不清楚。
• His bad behaviour has tarnished the good name of the school. 他行为不轨，败坏了学校的声誉。