哭求论文摘要的英文翻译。急用，不胜感激！！

Water pollution refers to a certain amount of sewage and waste water and waste material into such pollution of water, the water from beyond the net and carrying capacity, resulting in water and sediment of the physical, chemical and biological community composition and adverse changes, destroyed the ecological system and the inherent in the function, which can reduce the water use value. Water pollution caused by the factors are: to discharge without proper treatment of urban sewage and industrial wastewater, Use of chemical fertilizers and pesticides and the city ground water contaminants, runoff into water, with, With the atmospheric diffusion of toxic substances by gravity settlement or precipitation process and enter the water, etc. The first is one of the main factors of water pollution. The 1970s, along with the global industrial production and the development of social economy, the prosperity of industrial wastewater and city life wastewater into water, water pollution is ser