soot [sʊt]

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n.煤烟，烟尘；vt.熏以煤烟

a black powder made mainly of carbon which is produced when coal , wood , etc . is burnt

Soot is the product of the imperfect combustion of fuel. 煤烟是燃料不完全燃烧的产物。
The chimney was choked with soot. 烟囱被煤灰堵塞了。