检举员必须接受数小时的培训，才能掌握以“哈特·里奇烟度单位”(Hartridge unit)计算的“烟浓度”之类的概念。
Spotters must take hours of training to master such concepts as smoke density, measured in 'Hartridge units.
利用该燃烧模型进一步研究柴油机的燃烧和碳烟生成中的一些问题：如点火延迟时间与混合气浓度的关系，排气中的碳烟浓度与混合气油气当量比的关系。
Using a combustion model some problems such as: the relationship between ignition delay and fuel concentration, the relationship between soot concentration and the equivalent ratio of mixt...
烟羽表明在这些地区一氧化碳浓度的升高。
The smoke plume is reflected in elevated carbon monoxide concentrations in these regions.
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