美国国家老龄化研究所赞助的一项研究显示，世界最富裕国家的居民可能比此前预计的寿命更长。
Citizens of the world's wealthiest countries may live longer than previously predicted, according to a study sponsored by the National Institute on Aging.
最富裕国家与最贫穷国家之间，期望寿命的差异超过40岁。
The difference in life expectancy between the richest and poorest countries exceeds 40 years.
最富裕国家与最穷困国家之间预期寿命差异现已高达40多岁。
Differences in life expectancy between the richest and poorest countries are now greater than 40 years.
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