From the survey data, Berg's team created the first three-dimensional groundwater map, using statistical modelling to showlevels that are relatively arsenic-free.
从调查数据中，研究团队制成了第一张三维地下水地图，用统计模拟的方式显示了与不含砷相关的水平。
2
Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria.
与其他老鼠不同的是，在基因上无法制造这些特殊细胞的老鼠在感染细菌时不会表现出硝酸盐水平的升高。
3
Recent studies do in fact show that high carbon dioxide levels are associated with warm interglacial periods, and low levels with cold glacial periods.