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.
污染就是我们为了这个人口过密，过度工业化的星球所付出的代价。
Pollution is the price we pay for over populated, over-industrialized planet.
污染就是我们为这个人口过密，过度工业化的星球所付出的代价。
Pollution is the price we pay for an overpopulated, over industrialized planet.
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