It's caused by volatile organic compounds, or VOCs.

室内空气污染的源头是挥发性有机化合物（简称为VOCs）。

With smoke, and air pollution, you also have volatile organic compounds.

出现烟雾和空气污染时，你还会吸入挥发性有机化合物。

Those chemicals fall under the broader umbrella of volatile organic compounds, or VOCs.

这些化学物质都属于挥发性有机物，也就是 VOCs 的范畴。

What the plants pump through the air is a mixture of chemicals known as volatile organic compounds, VOCs for short.

通过空气，植物输送的是一种挥发性有机化合物的混合物，简称 VOCs。

And when something disrupts those processes, like a disease, the collection of volatile organic compounds in the breath may change, too.

当某种东西（如疾病）破坏这些过程时，呼吸中的挥发性有机化合物也会发生变化。

That, she explains, is because vanilla is one of the volatile flavour compounds present in breastmilk, as well as some formulas.

她解释说，这是因为香草是在母乳和一些配方奶粉中存在的挥发性风味化合物之一。

The other components to cinnamon are basically just volatile organic compounds, which give it that cake-y flavour that we all love.

肉桂粉的其他成分基本上是易挥发不稳定的有机成分，这也就是我们超爱的蛋糕香气的来源。

Given a dog's acute sense of smell, scientists think canines can pick up on volatile organic compounds that cancer cells give off.

鉴于狗狗敏锐的嗅觉，科学家们认为，犬科动物可以闻到癌细胞释放的挥发性有机物。

The analysis of these volatile organic compounds in our breath is called breath analysis.

对我们呼吸中这些挥发性有机化合物的分析称为呼吸分析。

Through the help of a consoling pessimism, we should strive to turn our rage and our tears into that far less volatile compound sadness.

通过一种安慰性的悲观主义，我们应该努力把愤怒和泪水转化成更不易波动的复合性悲伤。

They also measure volatile organic compounds, such as formaldehyde, contained in building materials or household products.

他们还测量建筑材料或家用产品中所含的挥发性有机化合物，例如甲醛。

That's because polyunsaturated fats have some weak carbon-hydrogen bonds, which break and set off a chain of chemical reactions that eventually produce volatile compounds.

这是因为多元不饱和脂肪含有一些弱性碳-氢键，它们会进行分解，并产生一连串化学反应，最终产生易挥发化合物。

Through the help of a consoling pessimism, we should strive to turn our rage and our tears into that far less volatile compound: sadness.

我们应该通过慰藉悲观努力将愤怒和眼泪转变成比较稳定的合成物：悲伤。

Others use an array of resistors made of different materials that each change their resistance when exposed to a certain mix of volatile organic compounds.

其他人则使用由不同材料制成的电阻器阵列，当暴露于挥发性有机化合物的特定混合物时中，每个电阻器的电阻都会改变。

Basically, the heat causes the lipids in the oil to break down and produce some volatile compounds, which are chemicals that can easily become gases.

基本上，高温会使得油中的脂类分解，并生成更易挥发的合成物，而这些合成物是易变成气体的化学物质。

But it's not like you can't taste anything — it's just that more subtle flavors involve more volatile compounds that are picked up by your olfactory receptors.

但不是说你什么都尝不到——只是更微妙的味道包含了更多的挥发性化合物，这些化合物会被你的嗅觉受体吸收。

So, what we do is allow the subject to blow into the device, we extract out the volatile organic compound we wish to measure, in this case acetone.

因此我们做的就是允许检测目标进入设备, 然后我们回提取希望测量的挥发性有机化合物, 在这种测试下是丙酮。

Similarly, regulations on vehicle emissions and gas content in the US reduced the volatile compounds in the air and smog levels along with them.

同样，美国关于车辆排放和气体含量的法规降低了空气中的挥发性化合物和烟雾浓度。

That’s because polyunsaturated fats have some weak carbon-hydrogen bonds, which break and set off a chain of chemical reactions that eventually produce volatile compounds.

这是因为多不饱和脂肪具有一些弱的碳氢键，这些碳氢键会破坏并引发一系列化学反应， 最终产生挥发性化合物。

Wolfe and his colleagues identified the microbial interactions by growing various cheese-dwelling fungi and bacteria in separate but adjacent dishes in the lab. The microbes couldn't touch-they could interact only via the volatile compounds they released.

沃尔夫和他的同事们（通过在实验室分离相邻培养皿中各种寄生于奶酪的真菌和细菌）来确定微生物之间的相互作用。微生物之间不能相互接触，它们只能通过释放的挥发性化合物进行相互作用。