soot black

同根派生

The 1000 annual launches would belch out about 600 tonnes of soot, or black carbon – less than today's output from airplanes and other sources.
每年1000次的發(fā)射率會釋放600噸的煙塵或黑碳----比飛機或其他每天的排放量要少。
"If I wore a white shirt to school, by the end of the day it would be brown, " recalls He, who was born in 1974, "and there would be a ring of black soot under the collar."
他回憶說：“如果我穿一件白襯衫去上學，一天下來襯衫就變成了棕褐色。領子下面還有一圈黑黑的煙灰。”
It is not possible to tell from this view exactly what pollutants made up the haze on February 20, but it probably contains mostly soot or black carbon and possibly some ground-level ozone.
從照片上我們不能得知污染物是如何造成2月20日的煙霧污染的，但是煙霧中很可能含有大量的煤灰或者炭黑也許還有地面臭氧。

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