Soot is the product of the imperfect combustion of fuel.
煤
是燃料
燃烧的产物。
Soot is the product of the imperfect combustion of fuel.
煤是燃料燃烧的产物。
The inside of a chimney soon gets covered in soot.
囱里面很快就覆盖了一层煤。
Soot is usually the product of the imperfect combustion of fuel.
煤通常是燃料燃烧的产物。
Afterwards " fuliginous model " , " photochemical smog " after pollution, modern is being entered with " indoor air is polluted " the 3rd generation that is a mark pollutes period.
继“煤型”、“光化学雾型”
，现代人正进入以“室内空气”为标志的第三代时期。
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代表本软件的观点；若发现问题，欢迎向我们指正。
