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But methane is actually odorless, too.
但是甲烷也是無味的。
Well then, what stinks?
那么，什么東西這么臭？
The foul smell is usually due to volatile sulfur compounds, such as hydrogen sulfide and methanethiol, or methyl mercaptan.
臭味一般是因?yàn)橛袚]發(fā)性的硫化物，如硫化氫和甲硫醇，或巰基甲烷。
These gases, however, constitute less than 1% of volume, and are often seen with ingestion of amino acids containing sulfur,
但是，這些氣體只占總量的1%，并且經(jīng)常因?yàn)槲覀償z入含硫氨基酸，
which may explain the foul smell of gas from certain high protein diets.
這可能解釋了臭氣是從某種高蛋白飲食中來的。
Increased passage of gas is commonly noticed after eating foods with high amounts of indigestible carbohydrates,
常常在吃了含有大量不易消化的碳水化合物的食物后，會(huì)產(chǎn)生更多的氣體，
like beans, lentils, dairy products, onions, garlic, leeks, radishes, potatoes,
如豆類，扁豆，乳制品，洋蔥，大蒜，韭蔥，蘿卜，馬鈴薯，
oats, wheat, cauliflower, broccoli, cabbage, and brussel sprouts.
燕麥，小麥，菜花，西蘭花，白菜及甘藍(lán)。
Humans lack the enzymes, so the bacteria able to ferment complex carbohydrates take over,
人體缺乏酶，因此那些能發(fā)酵復(fù)合碳水化合物的細(xì)菌就派上用場(chǎng)了，
and this naturally leads to more gas than usual.
這就會(huì)產(chǎn)生比平常更多的氣體。
But if you feel uncomfortable, bloated or visibly distended,
但是，如果你覺得不舒服，浮腫或明顯腫脹，
this may indicate impaired movement of gas along the gastrointestinal track.
這可能表明沿著胃腸道運(yùn)動(dòng)的氣體遇到了障礙。
It's important not to just blame certain foods for gas and bloating and then avoid them.
我們不能因?yàn)闈q肚就歸咎于某些食物然后就不吃它們。
You don't want to starve the bacteria that digest these complex carbohydrates,
你不會(huì)想餓著這些消化復(fù)雜碳水化合物的細(xì)菌，
or they'll have to start eating the sugars in the mucus lining of your intestines.
否則它們就會(huì)開始消化腸道粘膜里的糖。
Your personal gas will vary based on what you eat, and what bacteria are in your gut.
你身體里產(chǎn)生的氣體取決于你吃了什么以及你腸胃里的細(xì)菌種類。
For example, from the same starting sugar, the bacteria clostridium produces carbon dioxide,
例如，同樣是糖，梭狀芽孢桿菌會(huì)產(chǎn)生二氧化碳，丁酸鹽和氫氣，
butyrate and hydrogen, while propionibacterium can produce carbon dioxide, propionate and acetate.
然而丙酸桿菌可以產(chǎn)生二氧化碳，丙酸和乙酸。
