Michael听见有人喊他的名字，他在黑暗的囚室里到处查看，发现声音是来自排水口。
Michael, hearing his name, looks around his dark cell until he finds the drain.
研究者搜集了位于一个城市贫民窟和一个乡村的水样，这些水样分别来自排水沟，水坑以及河流。
The researchers collected water samples from gutters, puddles, and streams in two locations: an urban slum and a rural village.
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