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

室内空气污染的源头挥发性有机化合物（简称VOCs）。

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 VOCs 的范畴。

Those VOCs, as they are known, are produced by the body's normal chemical processes.

这些化合物在人体正常的化学过程中产生的。

Some VOCs are known to cause health issues like headaches or liver and kidney damage.

已知的一些挥发性有机化合物会导致头痛或肝脏和肾脏损害等问题。

Scientists have found that all kinds of plants give out VOCs when being attacked. It's a plant's way of crying out.

科学家发现，各种植物在受到攻击时都会释放出挥发性有机化合物，这一种植物的呼方式。

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

通过空气，植物输送的一种挥发性有机化合物的混合物，简称 VOCs。

A 2009 study tested 28 varieties of indoor plants and found four that were best at capturing every VOC the researchers threw at them.

2009 年的一项研究中测试了 28 中室内植物，发现其中有四种最善于捕获研究人员扔给它们的每一种挥发性有机物。

Scientists have found that all kinds of plants give out VOCs when being attacked.

科学家发现，各种植物在受到攻击时都会释放出VOCs。

But VOC is do more than just scatter blue.

但 VOC 的作用不仅仅蓝色。

[Narrator] The smell of freshly cut grass, that's a VOC and so is that classic Christmas tree smell.

- [旁白] 刚割下的草的气味，那挥发性有机化合物， 经典的圣诞树气味也如此。

VOCs are compounds that easily become vapors and may contain elements, such as carbon, oxygen, hydrogen, chlorine, and sulfur.

VOC 容易变成蒸汽的化合物，可能含有碳、氧、氢、氯和硫等元素。

The world's plants emit 500 million tons of VOC every year, and that can make a lot of ozone.

世界上的植物每年排放5亿吨VOC，这会产生大量的臭氧。

The VOC began settling the land with retiring Company employees - these  corporate settlers were known as 'farmers', or 'boers' in Dutch.

VOC 开始让退休的公司员工定居这片土地——这些公司移民在荷兰语中被称“农民”或“尔人”。

Initially, British policy toward indigenous workers was  little different from the authoritarian VOC, but as the century progressed, some improvements  were made.

起初，英国对待本土工人的政策与专制的荷兰东印度公司（VOC）并无太大差异，但随着世纪的推移，政策上有所改进。

But for a house or apartment, he says, " use a variety of plants to make sure you take all types of VOCs from your indoor air."

但尼里表示，对于房屋或者公寓来说，“可以用多种植物来吸收室内空气中的各种挥发性有机化合物。”

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。

Unlike the rigid caste system employed by the VOC, British law was steadfastly colourblind: laws applied equally to all groups under  British rule, although racially-charged unequal administration of the law was still  common.

与荷兰东印度公司（VOC）所实行的严格种姓制度不同，英国法律坚定地实行种族平等：法律适用于所有受英国统治的群体，尽管基于种族的不平等执法仍然很普遍。

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，似乎一种警报。植物通过空气输送的一种挥发性有机化合物的混合物，简称VOCs。

This was formalized  in 1652 when the Dutch East India Company, known by its Dutch initials VOC, founded a  permanent outpost at Cape Town to act as a way-station for the VOC ships travelling to Dutch  possessions in East Asia.

这在1652年得以正式化，当时荷兰东印度公司（以其荷兰语首字母缩写VOC著称）在开普敦建立了一个永久前哨站，作前往东亚洲荷兰领地的VOC船只的中途站。