"You're what you eat and drink, and that's recorded in you hair," said Thure Cerling, a geologist at the University of Utah.
“你就是你吃的喝的东西，在你的毛发中都有记录”犹他州地质学家托尔-瑟林说。
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James Ehleringer and Thure Cerling, at the University of Utah in Salt Lake City, and their colleagues collected human hair from barbers' shops in 65 American towns.