It allows women to collect fresh and unpolluted water on their doorsteps rather than being forced to trek many frustrating miles.
它使妇女可在家门口收集新鲜、未污染的水，而不必跋涉许多里路。
Every American deserves the cleanest air, the safest water, and unpolluted land, and each person can take steps to protect those precious resources.
每一个美国人都应享有最清新的空气、最安全的饮水和未受污染的土地，而且每个人都可以采取措施保护这些宝贵的资源。
Rain is slightly acidic even in unpolluted air, because carbon dioxide in the atmosphere and other natural acid-forming gases dissolve in the water.
就算空气没有被污染，雨水也是呈弱酸性的，因为大气中的二氧化碳和其他酸性的气体会溶解在（雨）水中。
Swimming in likes or streams is OK in most instances but in desert areas, leave scarce water holes undisturbed and unpolluted so animals may drink from them.
在溪流或类似地方游泳问题不大，但在沙漠上不行！让沙漠上珍贵的水源平静而无污染，许多的生物才得以饮用。
Methylmercury concentration of river water was similar to that of unpolluted lake water of Canada.
三峡库区江段江水甲基汞浓度与加拿大未被污染湖泊湖水相当。
Methylmercury concentration of river water was similar to that of unpolluted lake water of Canada.
三峡库区江段江水甲基汞浓度与加拿大未被污染湖泊湖水相当。
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