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）。

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的化学过程中产生的。

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

这些化学物质挥发性有机物，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。

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。

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

学家发现，各种植物在受到攻击时会释放出挥发性有机化合物，这是一种植物的呼救方式。

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.

学家发现，各种植物在受到攻击时会释放出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，那是挥发性有机化合物， 经典的圣诞树气味也是如此。

We're donating it to the local voc ed school so that they can use it for their program.

我们将把它捐赠给当地职业技术教育学校，供他们的项目使用。

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

VOCs指的是那些容易挥发成蒸气，并可能含有碳、氧、氢、氯、硫等元素的化合物。

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, however, figured out an ingenious solution, which would later on become the cornerstone of modern capitalism.

然而， 荷兰东印度公司想出了一个巧妙的解决方案，这后来成为了现代资本主义的基础。

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捕获研究人员扔给它们的每一种挥发性有机物。

Pretty much every rich man in the Netherlands invested in the VOC and even many immigrants did so.

基本上荷兰每个有钱人投资了荷兰东印度公司，甚至很多移民也这么做了。

With the island of Java as its headquarters, the VOC spread throughout the Far East.

以爪哇岛为总部，荷兰东印度公司遍布整个远东。

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

东印度公司开始让退休的公司员工定居这片土地——这些公司的定居者被称为“农民” ，或荷兰语中的“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.

最初， 英国对待本土工人的政策与权威的东印度公司相差无几，但随着世纪的推进， 一些改进措施被采纳。

In total, the VOC's initial public offering raised over 6 million guilders, which is equivalent to about $110 million today.

总的来说， 荷兰东印度公司的首次公开募股筹集了超过600万盾，这相当今天的约1.1亿美元。

The VOC got silk from China as well, which also produced valuable porcelain.

荷兰东印度公司还从中国获取丝绸，中国同时也生产珍贵的瓷器。