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

二氧化硫是一种污染物，并且是形成酸雨的主要因素。

《牛津词典》

Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants.

二氧化硫是酸雨的主要成因之一，它是一种特别严重的污染物，因为它会降低呼吸系统处理其他污染物的能力。

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But, the GNU Project isn't the only major contributor.

但是，GNU组织并不是唯一的主要贡献者。

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Falling housing prices have been a major contributor to U.S.economic woes since 2007.

VOA: standard.2009.08.25

Mbeki also said poverty was a major contributor to poor health.

VOA: standard.2010.05.17

As a major contributor to such loan guarantees, Germany wants stricter measures in place to keep countries from running up such high debts and to regulate the banking and financial sectors.

VOA: standard.2010.05.26

High default rates on construction loans were a major contributor to bank failures during the recession.

WSJ: Lending Resumes for Developers in Places Like Boise

And leaders continue to move the finish line to keep up a major contributor to change fatigue.

FORBES: A New Way Forward: The Better Way to Accelerate Change

The success of high fashion specialty retailers is a major contributor to this result.

FORBES: Department Store Pricing -- No Easy Task (Part 4 Of 4)