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

室内空气污染的源头是发性有机化合（简称为VOCs）。

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

这化合是人体正常的化学过程中产生的。

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

这化学质都属于发性有机，也就是 VOCs 的范畴。

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

已知的发性有机化合会导致头痛或肝脏和肾脏损害等问题。

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

通过空气，输送的是种发性有机化合的混合，简称 VOCs。

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，各种受到攻击时都会释放出发性有机化合，这是种的呼救方式。

But VOC is do more than just scatter blue.

但 VOC 的作用不仅仅是散布蓝色。

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

科学家发，各种受到攻击时都会释放出VOCs。

[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，那是发性有机化合， 经典的圣诞树气味也是如此。

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

VOC 是容易变成蒸汽的化合，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.

世界上的每年排放5亿吨VOC，这会产生大量的臭氧。

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 年的项研究中测试了 28 中室内，发其中有四种最善于捕获研究人员扔给它们的每种发性有机。

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。

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——这公司移民荷兰语中被称为“农民”或“布尔人”。

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."

但是尼里表示，对于房屋或者公寓来说，“可以用多种来吸收室内空气中的各种发性有机化合。”

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， 它的成因直是个谜，直到位名叫 Arie Haagen- Smit 的化学家确定了两个罪魁祸首，即发性有机化合 ( VOC)和氧化二氮。

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.

这化学质来自的受损部位，似乎是种警报。通过空气输送的是种发性有机化合的混合，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）开普敦建立了个永久前哨站，作为前往东亚洲荷兰领地的VOC船只的中途站。