The researchers detected the bacterialprotein in the plant detritus that was washed off the corn fields into streams up to 500 metres away.
研究人员从玉米地冲入500米之外溪流中的庄稼碎屑中发现了这种细菌蛋白。
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The reason is that milk protein and fruit sugars cannot be adequately removed from these containers and provide an environment for bacterial growth when water is stored in them.