水环境污染治理的研究已成为一个全球性的课题。
So the research of prevention water environment form pollution has been a global issue.
水体富营养化问题已成为当今世界性的水污染治理难题，也是全球性的环境问题之一。
Eutrophication of water bodies has become a global and difficult problem in controlling water pollution and is one of the most important environmental problems.
酸雨是公认的全球性三大环境问题之一，危害十分严重，而SO_2污染又是造成酸雨的主要因素之一，因此，必须对SO_2污染进行有效的治理。
"Acid rain" is one of the three most important global environmental problems, which is very harmful and mostly caused by SO_2. Therefore, it is imperative to control SO_2 pollution.
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