随着经济的发展人口的密集，人类来赖以生存的水资源污染日渐严重。一方面，

With the development of the economy and the dense population, the pollution of water resources on which mankind depends for survival has become increasingly serious. On the one hand, economic development often requires pollution of water resources as a cost. At the same time, the pollution of water resources increases the cost of economic development and severely restricts economic development.

With the development of the economy and the dense population, the pollution of water resources on which human beings depend is becoming more and more serious. On the one hand, economic development often needs to pollute water resources at the expense of water resources, at the same time, water pollution has increased the cost of economic development, seriously restricting economic development.

With the development of economy and the density of population, the pollution of water resources which human beings depend on is becoming more and more serious. At the same time, water pollution restricts the economic development.