The recession may have boosted this trend, he says, but it was not its primary cause.

他说，虽然经济衰退可能促进了这种替代趋势，但不是这种趋势出现的主要原因。

youdao

He also said that rising food prices were an aggravating factor of the unrest in the Middle East, although not its primary cause.

他同时还说道，虽然不是主要原因，但是食品价格恶化了中东不稳定的局势。

youdao

The square Windows on the original Comet jetliner were found to be the primary cause of its disintegration.

原彗星喷气式航空班机的方形窗被发现是其碎裂的主要原因。

youdao

The recession may have boosted this trend, he says, but it was not its primary cause.

ECONOMIST: Lawyers and your money

He also said that rising food prices were an aggravating factor of the unrest in the Middle East, although not its primary cause.

BBC: Food prices at dangerous levels, says World Bank

Zoellick also said that rising food inflation is part of the reason for the unrest in the Middle East and Northern Africa, although not its primary cause.

FORBES: Trading Food Inflation