在本项论述中，信函作者的结论是，全球性水与大气污染已致使世界范围内两栖动物的数量减少。
In this argument, the writer of the letter concludes that global pollution of water and air has caused a decline in the number of amphibians worldwide.
大气污染问题是全球性的，需要世界各国的共同努力才能逐步解决。
Air pollution is a global problem and it will be gradually solved with the joint efforts from all the countries of the world.
大气污染问题是全球性的，需要世界各国的共同努力才能逐步解决。
Air pollution is a global problem and it will be gradually solved with the joint efforts from all the countries of the world.
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