soot
noun [ U ] uk/sʊt/ us/sʊt/
煤烟;煤灰
a black powder composed mainly of carbon, produced when coal, wood, etc. is burned
It can be dangerous to let too much soot accumulate inside a chimney. 烟囱里堆积过多的煤灰是很危险的。
Compare: smut (DIRT)
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