现在在伊利诺伊州西北大学的研究者们，当时由德尔克·布洛克曼带头，对超过五十万张一美元钞票在五年内的活动情况进行了分析。

Researchers led by Dirk Brockmann, now at Northwestern University in Illinois, analysed the movements of more than half a million US one-dollar bills as they were passed around over five years.

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事实上，温瑟尔先生耶鲁大学的两名同事——理查德·普罗姆和维诺德库马尔·萨拉内森——正在研究这种五彩斑斓的“结构色”的进化。

Indeed, two of Mr Vinther's colleagues at Yale, Richard Prum and Vinodkumar Saranathan, are studying the evolution of such iridescent "structural" colours.

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研究人员坎塔·沃尔德派诺说，英国特易购在截止到11月28日的12周内，市场占有率上升到30.7%，去年同期为30.6%，这是今年五月以来市场占有率的第一次上升。

Tesco’s U.K. market share rose to 30.7 percent in the 12 weeks ended Nov. 28 from 30.6 percent a year earlier, the first increase since May, researcher Kantar Worldpanel said today.

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