eutrophication

Eutrophication caused by agricultural runoff depletes oxygen in water bodies, killing fish and other organisms.由农业径流引起的富营养化耗尽了水体中的氧气，杀死了鱼类和其他生物。

Reducing eutrophication requires stricter controls on fertiliser application and improved wastewater treatment.减少富营养化需要对化肥施用进行更严格的控制并改进废水处理。