他在1915年11月4日发表了第一次演讲，演讲解释了他的新方法，尽管他承认他还没有精确的数学公式。
His first lecture was delivered on Nov 4, 1915, and it explained his new approach, though he admitted he did not yet have the precise mathematical formulation of it.
杜克大学的研究人员详细核查了160多项已发表的研究，发现并没有强有力的证据表明这些方法中的任意之一能产生重大作用。
Researchers at Duke University scrutinized more than 160 published studies and found an absence of strong evidence that any of these approaches can make a big difference.
在思考这个问题的时候，我们偶然读到了查尔斯·琼斯和彼得·克莱诺最近发表的一篇文章，文章提出了一个衡量经济福利的新方法，挺有趣的。
While thinking about the question, we came across a recently published article by Charles Jones and Peter Klenow, which proposes an interesting new measure of economic welfare.
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