位于威斯康辛州的美国地质调查局派出研究小组，全面评估道路除雪对密尔沃基及周边地区河流的影响。
A team of US Geological Survey (USGS) researchers based in Wisconsin set out to comprehensively assess the effects of road deicing on streams in Milwaukee and surrounding areas.
记者对河流污染问题进行了调查。
测量，分析和维护在江河湖泊，雨水和污水中的水的质量和流动，并调查和绘制海洋，海和河流的地图。
Measures, analyses and maintains the flow and quality of water in rivers, lakes, stormwater and sewage, and surveys and maps oceans, seas and rivers.
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