水污染

Water pollution

自然环境  自然保护区    环境警钟   

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污水进入农灌渠

Wastewater discharged into irrigation canal

排进湖泊的污水

Wastewater discharged into lake

湖水富营养化

Eutrophication of water quality

城市污水直接排入河流

Urban wastewater discharged into river

污水横流

Wastewater flowing around

 工业污水排放

Discharged industrial wastewater