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For example, they'll break proteins into their component amino acids
比如，它們會把蛋白質分解成氨基酸成分，
and then break those down even further into various compounds.
然后再把這些更進一步分解成各種化合物。
Some of the foul-smelling byproducts of these reactions,
這些反應中產生的一些難聞的副產品，
such as hydrogen sulfide and cadaverine, escape into the air and waft their way towards unsuspecting noses.
比如硫化氫和尸胺，會逃進空氣中并一路飄到毫無戒備的鼻子里。
Our sensitivity to these odors and interpretation of them as bad smells may be an evolutionary mechanism
我們對這些氣味的敏感度以及將它們認知為難聞氣味的行為也許是一種進化機制，
warning us of rotten food and the presence of disease.
提醒我們注意腐壞的食物和疾病的存在。
Smell is one of our most intimate and primal senses, playing a huge role in our attraction to potential mates.
嗅覺是我們最私人和原始的感官之一，它在我們吸引潛在配偶時發揮著巨大的作用。
In one poll, 59% of men and 70% of women said they wouldn't go on a date with someone who has bad breath,
在一項民意測驗中，59%的男性和70%的女性表示他們不會和有口臭的人約會，
which may be why Americans alone spend $1 billion a year on various breath products.
而這也許就是美國人一年在各種除口臭產品上的花費達十億美元的原因。
Fortunately, most bad breath is easily treated.
好在大部分口臭問題都很容易對付。
The worst smelling byproducts come from gram-negative bacteria
最難聞的副產品是由革蘭氏陰性菌產生的，
that live in the spaces between gums and teeth and on the back of the tongue.
它們生活在牙床和牙齒之間，以及舌頭背面的位置。
By brushing and flossing our teeth, using antibacterial mouthwash at bedtime,
只要刷牙和用牙線潔牙，上床睡覺前使用殺菌漱口水，
gently cleaning the back of the tongue with a plastic scraper and even just eating a healthy breakfast,
用塑料刮板輕輕地清潔舌背，甚至只是吃一頓健康的早餐，
we can remove many of these bacteria and their food sources.
我們都能清除很多細菌及它們的食物來源。
In some cases, these measures may not be enough due to dental problems, nasal conditions, or rarer ailments, such as liver disease and uncontrolled diabetes.
在某些情況下，由于牙齒問題、鼻腔情況或像肝病和糖尿病這樣的較罕見疾病，這些措施也許遠遠不夠。
