1. Such streams are a serious public health hazard where they pass through villages and new towns. 
   这类污染的溪涧流经乡村及新市镇时，会严重威胁公众健康。
2. As it is, the public has continued to be exposed to the potential, though extremely rare, hazard of HIV in donor blood. 
   由此，人们还要继续面对在供体血液中尽管极其稀少，但仍然存在潜在hiv病毒的危机。
3. heat hazard in mine 
   矿井热害
4. laser hazard and precaution 
   激光危害与防护
5. planning of earthquake hazard control 
   城市防震规划

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