Environmental pollution that affects the life of this globe is described. Acid rain affecting ecological systems of human environment directly or indirectly, is discussed in detail.
本文介绍了世界范围的环境污染问题，详细论述了酸雨的形成及对人类生态环境的直接影响和间接影响。
Scientists say that plant and animal life in thousands of lakes in the United States and Canada has already been destroyed by acid rain.
科学家们说，在美国和加拿大成千上万个湖泊中的动植物都已经因酸雨而死亡。
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