“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.

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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.

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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.

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