So it seems like the likely source of water pollution would be factories, runoff from farms, sewage from cities.

所以看来最可能的水污染源是工厂，农场的水渠和城市的下水道。

Fertilizer and pesticide runoff are the two biggest sources of water pollution.

化肥和农药径流是水污染的两个最大来源。

" Industrial agriculture today is one of the largest sources of water pollution in the U.S., one of the largest sources of air pollution, one of the largest sources of greenhouse gas pollution." And get this.

“今天的工业化农业是美国最大的水污染源之一，最大的空气污染源之一，最大的温室气体污染源之一。”得到这个。