二、
Scientists have devised a way to determine roughly where a person has lived using a strand of hair , a technique that could help track the movements of criminal suspects or unidentified murder victims .
科学家们已经设计出了一种利用人的一缕头发头发估计其住处的方法,这种技术有助于追踪犯罪嫌疑人或者身份不明的谋杀受害者的动向。
The method relies on measuring how chemical variations in drinking water show up in peoples hair.
该方法利用的是测量人们的头发中所显示的饮用水的化学成分差异。
Youre what you eat and drink, and thats 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。
While U.S diet is relatively identical, water supplies vary.
美国人的饮食比较类似,但是水源的供应差异较大。
The differences result from weather patterns.
这种差异是气候模式导致的。
The chemical composition of rainfall changes slightly as raid clouds move.
随着雨云的移动,雨水的化学成分也有稍许的变化。
Most hydrogen and oxygen atoms in water are stable , but traces of both elements are also present as heavier isotopes .
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