This chemicalpollution 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。
2
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。
3
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.