This chemical pollution has two sources: the factories which dump polluted water directly into the river and the local community which dumps untreated human wastes into the river.

这种化学污染有两个来源：直接把污水倒进河里的工厂，和把未经处理的人类垃圾倒进河里的本地社区。

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Examples range from contamination of the food or water supply, to high levels of air or noise pollution, a chemical accident, a disease outbreak or a natural disaster.

这方面例子的范围包括从食物或水供应的污染，到空气或噪音高度污染、化学事故、疾病暴发或自然灾害。

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A: On top of that, there are a few large chemical factories in the suburbs, which are contributing to the high pollution levels in the water and the air in this city.

最要命的是，郊区还有好几家大型化工厂，这些工厂是这个城市空气和水污染的罪魁祸首。

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China also missed its target for chemical oxygen demand, a measure of water pollution.

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China issued a second water-pollution alert within a month, when phenol, a dangerous chemical, leaked into the Yangzi river near Shanghai.

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They also argued over-use of the company's weedkiller Roundup, the chemical treatment the alfalfa is modified to be resistant to, could cause pollution of ground water and lead to resistant "super-weeds".

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