時差N小時:飲料的神奇清潔能力
有個去污點子：
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，可以使用可口可樂或者其它可樂飲料，清洗后的燭臺光亮如新。
And if Cola is such an effective cleaner of corrodedmetal , what is it doing to the inside ofyour stomach?
如果可樂能有效清潔金屬銹斑，那么可樂對人體的胃會產生什么影響呢?
Cola cleans brass because it's mildly acidic.
可樂能清潔銅銹是因為可樂呈弱酸性。
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為空氣中的氧氣和合金中的某種金屬發(fā)生了化學反應。
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，比如可樂中的弱酸，和氧化物產生化學反應，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，化學反應后的金屬锃亮。
You can try this at home, even if you don't have a brass candle stick.
即便家里沒有銅燭臺，你可以做這樣的試驗：
Leave a tarnished oldpenny in a glass of cola overnight.
晚上，將一枚舊硬幣丟進裝有可樂的杯里。
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?
如果可樂能有效清潔金屬銹斑，那么可樂對人體的內臟會產生什么影響呢?
Actually, your stomach already contains its own supply of acid which it uses to digest food.
事實上，人體的胃里就有分泌的酸液來消化食物。
This stomach acid is a great deal stronger than the acid in a can of Coke.
胃酸的酸性比一聽可樂還強。
Indeed, stomach acidwould be an even better tarnish remover than cola!
說真的，胃酸甚至比可樂更能除銹。
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