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BNC: 14702 COCA: 14589

a black powder composed mainly of carbon, produced when coal, wood, etc. is burned煤烟;煤灰

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。
BNC: 14702 COCA: 14589
BNC: 14702 COCA: 14589
soot noun
dirt
BNC: 14702 COCA: 14589
soot
Products of fire: ash, brand, charcoal...
Dirty: dirty, filthy, messy...

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