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为什么某些屁闻起来很糟糕? – 译学馆
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为什么某些屁闻起来很糟糕?

Why Do Some Farts Smell So Bad?

[开场音乐]
[INTRO ♪]
“不要直接在食物附近放屁”
“Don’t fart naked near food.”
这个半开玩笑的结论出自一对澳洲科学家
That was a tongue-in-cheek conclusion from a couple of Australian scientists
他们在2001年做了有关放屁的实验
in 2001 who conducted an experiment on farts.
一个护士曾问他们如果在无菌环境放屁
A nurse had asked them if farting in a sterile environment,
比如在她的手术室 是否会引发感染
like the surgery room she worked in, could cause infections.
这个问题有点古怪 但并不完全荒谬
It’s kind of a weird question, but maybe not entirely ridiculous.
所以他们着手调查屁是否有潜在威胁 或只是臭气
So these researchers looked into whether farts were potentially harmful, or just stinky clouds.
和很多实验一样 他们也进行了分析屁成分的实验
And their experiment was just one of many that analyzed what farts are made of.
医学期刊称 屁部分产自你生活中吸入的气体
Flatus, as medical journals call it, is partially produced by swallowing air as you go about your life.
但大部分屁是你肠胃中万亿计的微生物的副产物
But farts are mostly a by-product made by the trillions of tiny microbes that live in your gut,
它们消化糖类并产生气体
digesting carbohydrates and spewing out gases.
成人每天放屁高达20次主要排放没有气味的气体
Humans fart up to 20 times per day or more, and release mostly odorless gases
比如氮气 氧气 二氧化碳和氢气
like nitrogen, oxygen, carbon dioxide, and hydrogen.
但也有一小部分气体有味道
But there’s a tiny percentage of the stuff that smells.
非常难闻
Really bad.
也许你会吃惊甲烷并不是罪魁祸首
It may surprise you that methane isn’t the culprit.
它易燃 还是温室气体 但它没有味道
It’s flammable, and a greenhouse gas, but it doesn’t smell.
更不必说 不是所有人肠胃里起初就有产生甲烷的细菌
Not to mention, not all of us have gut bacteria that produce methane in the first place.
屁的味道归于一组包含硫元素的混合物
Fart smells are actually due to a handful of compounds that contain sulfur:
硫化氢 甲硫醇和二甲基硫醚
hydrogen sulfide, methanethiol, and dimethyl sulfide.
硫化氢是闻起来像臭鸡蛋的无色气体
Hydrogen sulfide is a colorless gas that smells like rotten eggs.
它易燃 且浓度高时毒性强
It’s flammable, and in large quantities, it’s also highly poisonous.
和其他毒素一样 硫化氢能干扰酶的运行
Like some other toxins, hydrogen sulfide messes with enzymes
这种酶使你细胞中的线粒体制造能量
that let the mitochondria in your cells make energy.
幸运的是 屁中含有极少量硫化氢
Fortunately for us, farts contain tiny amounts of it.
所以我们能闻到气味 但不会真的有危险
So we smell it, but we’re not in any real danger.
甲硫醇是另一种含硫气体 闻起来像烂蔬菜
Methanethiol is another sulfurous chemical, and it smells like rotting vegetables.
产生它的细菌亦来自口臭
It’s produced by bacteria that are also involved in things like terrible breath and
和制造奶酪的过程
making some cheeses.
在极高浓度下 和硫化氢一样有毒性
At super high concentrations, it can be toxic like hydrogen sulfide.
但同样地 屁中含量只引起臭味 没有危险
But, again, the amount in farts is just stinky, not dangerous.
再说说二甲基硫醚
And then there’s dimethyl sulfide.
这种气体被描述为有甜味
This gas has been described as having a sweet odor …
但绝对不是好闻的那种
but definitely not in a good way.
而是像卷心菜的味道
In a cabbage way.
你放的屁中这三种气体的含量取决于饮食
The amounts of all three of these chemicals in your farts depends on what you eat.
如果你爱吃含大量硫元素的食物
If you snack on foods that have a lot of sulfur-containing compounds,
比如卷心菜 花椰菜或鸡蛋那么你肠内细菌就会产生更多含硫气体
like cabbage, broccoli, or eggs, then your gut bacteria will produce more sulfurous gases.
你的屁会把更多人赶出屋子
And your farts might drive more people from the room.
然而幸运的是 对于给病人做手术的医生来说
Fortunately for doctors operating on patients, though,
有2001个实验检测屁的传染性发现
that 2001 experiment testing the infectiousness of farts found that
如果隔着衣服放屁 细菌不会扩散
bacteria aren’t spread if you fart through clothing.
所以气味也许会影响你的同事
So the smell might cause some problems for your coworkers,
但只是臭气 没有危险
but it’s all stink and no real danger.
感谢提问 感谢我们所有的赞助人赞助人确保我们持续回答问题
Thanks for asking, and thanks to all our patron.And patrons keep these answers coming.
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If you’d like to submit questions to be answered, you can go to patreon.com/scishow.
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屁的主要气味来自硫化合物

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