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

VOA: special.2010.06.08

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 United Nations Security Council later imposed sanctions on Pyongyang, which have impeded its efforts to sell conventional weapons abroad, a major source of income for the cash-strapped nation.

VOA: standard.2009.12.08

"While cost remains a major factor in decisions about where to off-source, the quality of the labor pool is gaining importance, and this includes English language skills."

VOA: special.2011.01.21

"If the drugs ended tomorrow, it would not have a major effect on the Taliban source of funding,"

VOA: standard.2009.06.15

It's a very lucrative source of money. It is a major business in Afghanistan."

VOA: standard.2009.09.10