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

室内空气污染源头是挥发性有机化合物（简称为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，也就是 VOCs 范畴。

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

这些化合物是在人体正常化学过程中产。

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

已知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，各植物在受到攻击时都会释放出挥发性有机化合物，这是植物呼方式。

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

通过空气，植物输送是挥发性有机化合物混合物，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 年项研究中测试了 28 中室内植物，发现其中有四最善于捕获研究人员扔给它们挥发性有机物。

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 作用不仅仅是散布蓝色。

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

- [旁白] 刚割下草气味，那是挥发性有机化合物， 经典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.

世界上植物年排放5亿吨VOC，这会产大量臭氧。

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

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

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

起初，英国对待本土工人政策与专制荷兰东印度公司（VOC）并无太大差异，但随着世纪推移，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."

但是尼里表示，对于房屋或者公寓来说，“可以用多植物来吸收室内空气中各挥发性有机化合物。”

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煤， 它成因直是个谜，直到位名叫 Arie Haagen- Smit 化学家确定了两个罪魁祸首，即挥发性有机化合物 ( 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）所实行严格姓制度不同，英国法律坚定地实行族平等：法律适用于所有受英国统治群体，尽管基于族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受损部位，似乎是警报。植物通过空气输送是挥发性有机化合物混合物，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）在开普敦建立了个永久前哨站，作为前往东亚洲荷兰领地VOC船只中途站。