产速太慢，底层再次氧化，如镍层在金槽氧化(或金还原)，剥锡。

Production speed too slow, the bottom again, such as nickel oxide layer in gold slot oxidation (or gold reduction), peel tin.

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在燃烧后期，约70 ~ 80%碳微粒被再次氧化，此后微粒质量浓度接近于排放水平。

The soot particles are oxidized by about 70 ~ 80% in the late combustion phase. And then, the mass concentration of particulate equals to the concentration in the tail pipe.

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再次强调，公路运输是罪魁祸首，因为仅公路运输就占了运输产生的二氧化碳排放量的84%。

Once again, road transport is the main culprit since it alone accounts for 84% of the carbon dioxide emissions attributable to transport.

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