“我在那里游览的前前后后，没见到过一次太阳；天空一直被遮在烟雾里。”他说。
"The entire time I was there, I didn't see the sun once; the skies were perpetually covered in smog," he said.
莫斯科的空气，在最好的时候是受到了污染，而这种烟雾里含有大量的一氧化碳，让人呼吸困难。
Moscow's air is polluted at the best of times, but this smog, heavy with carbon monoxide, makes breathing difficult.
一名徒步旅行者在俄罗斯的堪察加半岛的火山烟雾里攀登。
A hiker climbs amid volcanic fumes in Russia's Kamchatka peninsula.
的反应，Which，is，the，reaction，of，N2O4，也是气体等于2个，也是气体这是烟雾里,经常发生的反应，在城市里很常见。
N2O4 NO2 which is a gas, to 2 NO2, which is a gas, the kind of reaction that happens when you have smog and, fairly common in big cities.
的反应，Which，is，the，reaction，of，N2O4，也是气体等于2个，也是气体这是烟雾里,经常发生的反应，在城市里很常见。
N2O4 NO2 which is a gas, to 2 NO2, which is a gas, the kind of reaction that happens when you have smog and, fairly common in big cities.
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