欧德询问有谁知道这里用的是哪种气体，“很天然的气体，” Schlangen的回答非常正确——这是利用人类排泄物生产的生化气体。

Oduor asked if anyone knew what type of gas was being used. "Very natural gas, " Schlangen answered correctly – biogas made from human waste.

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次生气溶胶最初以气体形态出现，在大气中发生化学反应从而形成颗粒物。

Secondary aerosols begin life as gases and chemically react in the atmosphere to form particles.

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与气体中的添加剂完全不发生化学反应。

And in the gas additive not produce chemical reaction.

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