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。

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。

Exhaled breath contains trace amounts of hundreds, even thousands, of volatile organic compounds: small molecules lightweight enough to travel easily as gases.

呼气中含有微量的数百，甚至数千种挥发性有机化合物：小分子轻巧，足以像气体一样轻松地传播。

In addition to the volatile organic compounds like ethanol we consume in food and drink, the biochemical processes of our cells produce many others.

除了我们在食物和饮料中消耗的挥发性有机化合物（例如乙醇）之外，细胞的生化过程还会产生许多其他元素。

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。

Or volatile organic compounds, the thousands of chemicals in everyday products that we end up breathing.

或挥发性有机化合物，我们最终呼吸的日常产品中的数千种化学物质。

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。

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。

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。

This scent is made up of volatile organic compounds (VOCs) that come from the injured parts of the plant and serve as an alarm.

这种气味由来自植物受伤部位的挥发性有机化合物 (VOC) 组成，可作为警报。

Since the city didn't burn much coal, its cause would remain a mystery until a chemist named Arie Haagen-Smit identified two culprits, volatile organic compounds, or VOCs, and nitrous oxides.

由于这座城市没有燃烧太多的煤， 它的成因一直是个谜，直到一位名叫 Arie Haagen- Smit 的化学家确定了两个罪魁祸首，即挥发性有机化合物 ( VOC)和一氧化二氮。

Total emissions of chemical oxygen demand and ammonia nitrogen will see an 8-percent drop, and that of oxynitride and volatile organic compounds will be reduced by more than 10% from 2020 levels, said the plan.

化学需氧量、氨氮、氮氧化物、挥发性有机物排放总量比2020年分别下降8%、8%、10%以上、10%以上。

These chemicals come from the injured parts of the plant and seem to be an alarm. What the plants pump through the air is a mixture of chemicals known as volatile organic compounds, VOCs for short.

这些化学物质来自植物的受损部位，似乎是一种警报。植物通过空气输送的是一种挥发性有机化合物的混合物，简称VOCs。