"African-American men in the south have the lowest life expectancy, along with African-American men living in high-risk urban areas, places like downtown Los Angeles."

VOA: standard.2010.04.08

Back in the 1840s, life insurance was very important because the average expectancy of life was only something like forty-five years, so that meant parents were dying left and right.

在19世纪40年代的时候,寿险是非常重要的,因为当时的人均期望寿命,仅为45岁左右,这意味着双亲平均只能活到45岁

耶鲁公开课 - 金融市场课程节选

African-American women are another group with low life expectancy because of their high rates of obesity.

VOA: standard.2010.04.08