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 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。
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“煤烟型”、“光化学烟雾型”
染后，现代人正进入以“室内空气染”为标志的第三代染时期。
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