Owing to the abundance of the raw materials, and the full utilization of the abandoned materials, the pollutionofriver environment is decreased simultaneously with the income being increased.
鉴于原料丰富，又充分利用了废弃物，所以既减少了对江河环境的污染。
2
The level ofpollution in the river was falling.
该河流受污染的程度其时正在降低。
《柯林斯英汉双解大词典》
3
The Yangtze River provides one third of the country's freshwater resources, but it has met lots of environmental problems in recent years, such as heavy pollution and overfishing.