Tourism is a major source of income for the area.

旅游业是这个地区的主要收入来源。

《牛津词典》

According to a recent survey, employees who have a job reliant on IT support consider IT a major source of job dissatisfaction.

根据最近的一项调查，工作依赖于信息技术支持的员工认为信息技术是工作不满度的主要来源。

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For example, when the board of the University of Colorado searched for a new president, it wanted a leader familiar with the state government, a major source of the university's budget.

例如，当科罗拉多大学董事会在物色一位新校长时，想要的是一位熟悉州政府事务的领导，因为州政府是该校预算的主要来源。

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The Ogallala aquifer is a major source of drinking and irrigation water for America's central plains.

VOA: special.2011.07.08

For a typical household, the home is the major source of wealth that they've accumulated.

对于一个典型的家庭来说,他们积累的财富主要就是住宅

耶鲁公开课 - 金融市场课程节选

The plant is a major source of food energy and a major food security crop.

VOA: special.2010.06.08

The oil and gas sector currently represents a major source of economic growth and jobs.

FORBES: The Jobs Speech Obama Should Give, But Won't

Dr. TILMAN: Corn is a major source of food for the U.S. and the world.

NPR: Biofuels and Food Prices

Power says that baggage fees continue to be a major source of passenger dissatisfaction.

FORBES: America's Most Satisfying Airlines