時(shí)差N小時(shí):飲料的神奇清潔能力

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https://online2.tingclass.net/lesson/shi0529/0009/9697/589.mp3

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有個(gè)去污點(diǎn)子：

If you have some tarnished orcorroded brass thatyou want to clean, an old brass candlestickforexample, you can use Coca-Cola, or any other colasoftdrink, and that brass will come clean.

如果你想要清除銅銹，例如銅燭臺(tái)，可以使用可口可樂(lè)或者其它可樂(lè)飲料，清洗后的燭臺(tái)光亮如新。

And if Cola is such an effective cleaner of corrodedmetal , what is it doing to the inside ofyour stomach?

如果可樂(lè)能有效清潔金屬銹斑，那么可樂(lè)對(duì)人體的胃會(huì)產(chǎn)生什么影響呢?

Cola cleans brass because it's mildly acidic.

可樂(lè)能清潔銅銹是因?yàn)榭蓸?lè)呈弱酸性。

Here's what happens:When brass or another metal alloy becomes tarnished, this means thattherehas been a chemical reaction between the oxygen in the air and one of the metals in thealloy.

銅或其它金屬合金生銹是因?yàn)榭諝庵械难鯕夂秃辖鹬械哪撤N金屬發(fā)生了化學(xué)反應(yīng)。

Oxygen atoms combine with metal atoms to form what's called an oxide, and this oxide iswhatmakes the metal appear tarnished.

氧原子結(jié)合了金屬原子，形成所謂的氧化物。氧化物就是金屬銹。

Acids, like the weak acid present in your can of Coke, can reactwith oxides to effectivelyreverse the process of tarnishing.

而酸，比如可樂(lè)中的弱酸，和氧化物產(chǎn)生化學(xué)反應(yīng)，能有效避免生銹。

The acid dissolves the metal oxides thatmake the tarnish, leaving only shiny metal behind.

酸可以分解金屬氧化物，化學(xué)反應(yīng)后的金屬锃亮。

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

即便家里沒(méi)有銅燭臺(tái)，你可以做這樣的試驗(yàn)：

Leave a tarnished oldpenny in a glass of cola overnight.

晚上，將一枚舊硬幣丟進(jìn)裝有可樂(lè)的杯里。

In the morning it will be shiny and fresh.

第二天早上，硬幣就變得閃亮如新。

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

如果可樂(lè)能有效清潔金屬銹斑，那么可樂(lè)對(duì)人體的內(nèi)臟會(huì)產(chǎn)生什么影響呢?

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

事實(shí)上，人體的胃里就有分泌的酸液來(lái)消化食物。

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

胃酸的酸性比一聽(tīng)可樂(lè)還強(qiáng)。

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

說(shuō)真的，胃酸甚至比可樂(lè)更能除銹。