Eutraphication is one of most serious water pollution problems in the world.
湖泊富营养化是当今世界面临的最主要水污染问题之一。
Its pollution problems are not different in kind from those of any other big city.
该城的污染问题与其它城市的污染问题没有什么实质区别。
The resolution of our air and water pollution problems will be difficult and costly.
要解决我们空气和水源的污染问题，困难很多而且耗资很大。
I am afraid that there will be more and more pollution problems.
我恐怕污染的问题会越来越多。
I am afraid that there will be more and more pollution problems.
我恐怕污染的问题会越来越多。
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