这种环境污染早在多年前就已被科学家知晓，并催生出酒店、餐厅等场所的吸烟室和无烟室。

But thirdhand smoke has also been found in environments which were not known to be contaminated by smokers, which led researchers to ask how that could happen.

但是在未被吸烟者污染过的环境中也发现了三手烟，这让研究人员发问：这是怎么发生的？

To find out, Gentner and some of his PhD students set up an experiment in a movie theater that had not allowed smoking for more than 15 years. They supplied fresh air into the theater, making sure that no smoking or other contaminants entered the space.

为了找寻答案，金特纳和他的一些博士生在一家禁烟超过15年的电影院开展了一个实验。他们给影院输入新鲜空气，确保烟雾和其他污染物不进入这一空间。

Sophisticated equipment measured airborne particles before and after moviegoers arrived. Right away, they saw a huge spike in levels of hazardous chemicals.

在观众到达影院前后，他们用精密的仪器测量了空气中的颗粒物。很快，他们就看见有害化学物质的水平大幅上升。

As people came into the theater, the concentrations went up, and then decreased over time, Gentner said.

金特纳说，随着人们进入影院，有害化学物质的浓度上升了，但随着时间过去又下降了。

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