最大的危险存在于以卫生设施不良和饮用水不安全为特点的人口过密的社区和难民居住地。
The greatest risk occurs in overpopulated communities and refugee settings characterized by poor sanitation and unsafe drinking water.
本文针对该隧洞的特点依据保障隧道内乘驶机动车各人员健康、卫生和隧道的营运安全为原则对污染物浓度设计限值进行了研究。
This paper made some investigation about the permissible concentration limits about contaminations in roadway tunnel from the point of view of the effects on the body.
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