You have a case study to do by the end of the course, which might involve doing a survey or something like that, and also you need to hand in a short report every four weeks.

在这门课程结束时还要做一个案例研究，这可能会是一个调查或类似的事，而且每四周还要交一份简短的报告。

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These findings confirm a 2002 report by the U. s. Geological Survey that was the first nationwide study of pharmaceutical pollution in the nation's rivers and streams.

此次调查结果印证了一份于2002年发布的‘美国地质调查’所得到的结果，这也是当时第一份关于国家河流和小溪被药剂污染全国性调查报告。

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