1 . Their faces were blackened with soot .

他们满脸煤灰。

来自《权威词典》

2 . Soot is the product of the imperfect combustion of fuel.

煤烟是燃料不完全燃烧的产物.

来自《简明英汉词典》

3 . Soot is usually the product of the imperfect combustion of fuel.

煤烟通常是燃料不完全燃烧的产物.

来自《简明英汉词典》

4 . The inside of a chimney soon gets covered in soot .

烟囱里面很快就覆盖了一层煤烟.

来自《简明英汉词典》

5 . Soot fouls the air.

烟屑污染空气.

来自《现代汉英综合大词典》

(as) black as soot

1 . 非常黑