While the levels of the chemical, perchlorate, have been deemed safe by the Environmental Protection Agency, some worry public health is at risk.

被检出物质——高氯酸盐，美国环保署认为它的含量在安全范围内，但是一些人士担心，公共健康处在危险之中。

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Public health policies and regulation should recognize that while no tobacco product has been shown to be safe, some present more risk than others.

公共卫生政策和规则应当承认，没有烟草产品是安全的，一些烟草产品的危害比其他的更大。

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Men, the number one public health risk, are safe.

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Our Nation's public safety officers are heroes who risk their lives to keep our families and communities safe.

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Meanwhile, Moody's Investors Service said the U.S. government's AAA-rating is safe, though it noted it could be at risk if it doesn't reign in its public debt.

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