与香烟一起吸入的尼古丁和一氧化碳已经被指控为诱发性因素。

Both nicotine and carbon monoxide inhaled with cigarette smoking have been incriminated as causative factors.

《柯林斯英汉双解大词典》

二氧化硫是一种污染物，并且是形成酸雨的主要因素。

Sulphur dioxide is a pollutant and a major contributor to acid rain.

《牛津词典》

砍伐森林建牧场，以及过度放牧导致土壤中碳含量的净流失等因素都会产生大量的二氧化碳。

Livestock farming also accounts for a lot of carbon dioxide, mostly from forests being cut down for pasture, or when overgrazing and the resulting soil erosion causes a net loss of carbon from soils.

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