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。

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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。

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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。

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Chemistry can facilitate access to unpolluted water sources -- a challenge that will affect future stability in many regions.

UNESCO: Message by UNESCO Director-General Irina Bokova

In January of this year, a judge in Virginia ruled against the EPA, which had arrogated to itself the power to regulate unpolluted storm water that runs into a creek.

FORBES: The EPA: The Worst of Many Rogue Federal Agencies, Part II