For example, sleep duration has declined from some 8 hours in the 1950s to 7 in recent years.

例如，睡眠时间从20世纪50年代的8小时左右下降到近年来的7小时。

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In recent years, new clues have come from research into genetics, including the distribution of genetic markers in modern Native Americans.

近年来，遗传学研究提供了新的线索，包括现代美洲土著民基因标记的分布。

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The average time for holding a stock in both the United States and Britain, he notes, has dropped from seven years to seven months in recent decades.

他特别提到，最近几十年，无论是在美国还是在英国，持有一支股票的平均时间都从七年下降到了七个月。

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In recent years, the high court has considered an average of about 80 cases each year selected from about 8,000 requests for review.

VOA: standard.2009.10.01

Espinoza says there was little interest in him from the American team, which has become the strongest in the region in recent years.

VOA: standard.2010.06.09

(No Transcripts here) President Obama says the decision to send the reinforcements is designed, in part,to seize the initiative from the Taliban, which has been gaining ground in recent years.

VOA: standard.2009.12.08

What seems clear is that the economy is still settling from the shocks of recent years and industrial organizations are in the process of adjusting their strategies and personnel needed to tackle new market conditions.

FORBES: 2013 R&D Spending Outlook: Mildly Optimistic and Stable

He argues that the surplus from recent years will reduce the impact of this year's poor harvest.

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The new developments include a switch to slick tyres from the grooved ones of recent years, and the introduction of the kinetic energy recovery system (Kers), which stores energy recovered from the rear axle during braking and converts it to supply a brief power boost.

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