水中的大部分氢原子和氧原子处于稳定的状态,但是两种元素的轨迹都以质量更重的同位素形式存在,较重的雨先落下。
The heaviest raid falls first .As a result, storms that form over the Pacific deliver heavier water to California than to Utah.
结果,来自于太平洋的暴风雨会给加州带来比犹他州质量更重的水。
Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline.
相似的模式在全美都存在。通过测量一缕头发中较重的氢氧同位素的比例,科学家们可以构建一个地理学的时间轴。
Each inch of hair corresponds to about two months.
每一英寸的头发对应大概两个月的时间。
Cerlings team collected tap water samples from 600 cities and constructed a mop of the regional differences.
瑟林的团队手机了来自600个城市的自来水样本,构建了区域间差异的地图。
They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops.
他妈呢从65家理发店中收集了200份头发样品,用以测试该地图的准确性。
They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of raid systems.
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