soot造句

Their faces were blackened with soot.
他们满脸煤灰。

Soot is the product of the imperfect combustion of fuel.
煤烟是燃料不完全燃烧的产物.

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.

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