Rainforests have been called the "lungs of the Earth," because they filter our air by absorbing CO2, while emitting life-supporting oxygen.
雨林被称为地球的“肺”，因为它们过滤空气吸收二氧化碳，而排放维持生命的氧气。
If you have ever held a cloth or handkerchief over your mouth to keep dust out of your lungs, you have created an improvised particulate filter.
如果你曾经用布或手绢捂住嘴来阻挡灰尘吸入，那么你就自创了简易微粒过滤器。
Too small for your nose and airways to filter out, these particles settle deep in the lungs.
对你的鼻子和气道来说，太小以至于不能滤过，这些颗粒在肺的深处定居。
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