四十年前，心理学研究者保罗·埃克曼博士给一群年轻的精神病医生做培训演讲时，有人向他提出了一个疑问，自此他一直忙于寻找该问题的答案。
Forty years ago, the research psychologist Dr Paul Ekman was addressing a group of young psychiatrists in training when he was asked a question whose answer has kept him busy pretty much ever since.
卡洛·沃斯曼，博士，人类学家，供职于乔治亚州亚特兰大市的埃默里大学。
Carol Worthman, PhD, an anthropologist at Emory University in Atlanta, Georgia.
食盐的各种争论存在一个问题，埃德尔曼博士说，就是所有的调查研究其实都是不完善的。
One problem with the salt debates, Dr. Alderman said, is that all the studies are inadequate.
食盐的各种争论存在一个问题，埃德尔曼博士说，就是所有的调查研究其实都是不完善的。
One problem with the salt debates, Dr.Alderman said, is that all the studies are inadequate.
食盐的各种争论存在一个问题，埃德尔曼博士说，就是所有的调查研究其实都是不完善的。
One problem with the salt debates, Dr.Alderman said, is that all the studies are inadequate.
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