For example, the average duration of human life has hardly changed in thousands of years.

例如，人类的平均寿命在几千年里几乎没有改变。

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The country is suffering its highest average duration of unemployment since at least 1948.

美国正在遭受至少是从1948年以来失业率平均持续最长的时期。

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The average duration was down to 44 minutes and 3 seconds, with an average cost of $12.06 per request.

平均持续时间缩短到 44 分钟 3 秒，每个请求的平均成本为 12.06 美元。

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The reason most wise investors hold portfolios of munis of average duration 3-5 years.

FORBES: Muni Bond Defaults Will Be Rare

The average duration of unemployment rose to 36.9 weeks, up from 35.3 weeks in January.

WSJ: Zuckerman: The Great Recession Has Been Followed by the Grand Illusion

The average duration on treasury debt runs around 5 years and this is too low.

FORBES: This Is The Way The World Ends