Hydrogen and oxygen stable isotope analyses of precipitation sampled at Erlan...
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Shallow groundwater aquifers are often influenced by anthropogenic contaminants or increased nutrient levels. In contrast, deeper aquifers hold potentially pristine paleo-waters...
浅层地下水含水层（shallow groundwater aquifers）通常会受到人为源污染物或营养盐浓度升高的影响。与之相反，深层地下水含水层则蕴藏着可能未受污染的古地下水（paleo-waters）……
