Free radicals also come from outside sources, such as smoking, environmental pollution, and synthetic chemicals that are added to our water and food. Some tips for living longer and anti-aging.

同时外界的因素也会产生自由基如抽烟环境污染还有那些添加在饮用水和食物里的人工合成化学物质。一些使你延缓衰老和更长寿的方法。

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The municipalities are now looking for private help as the Environmental Protection Agency imposes standards on water quality that municipalities cannot satisfy without outside financing and expertise.

ECONOMIST: Water