但城镇及其周围河流沉积物中富集的重金属含量很高，其潜在环境风险不容忽视。
However, the potential risk of heavy metal pollution in the water should not be overlooked considering the high concentrations of heavy metals in the river sediments in and around towns.
这份报告由英国皇家环境污染委员会完成，它说，尽管纳米材料迄今为止没有表明有害的迹象，但是对其潜在风险的研究还有“严重的欠缺”。
The UK-based Royal Commission on Environmental Pollution says that while the materials have so far shown no sign of being harmful, there is a "major gap" in research about their potential risks.
其它潜在的传染风险包括具有耐药性的微生物从卫生保健机构传播到环境当中。
Other potential infectious risks may include the spread of drug-resistant micro-organisms from health-care establishments into the environment.
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