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次的发射率会释放600吨的烟尘或黑碳----比飞机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."
他回忆说：“如果我穿一件白衬衫去上学，一天下来衬衫就变成了棕褐色。领子下面还有一圈黑黑的烟灰。”
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.
从照片上我们不能得知污染物是如何造成2月20日的烟雾污染的，但是烟雾中很可能含有大量的煤灰或者炭黑也许还有地面臭氧。

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He did this so many times that the walls of his cell were black with soot.
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