The Clean Air Act mandates the EPA to regulate harmful pollutants such as particulate matter and ozone.

《清洁空气法》授权美国环保局监管有害污染物，如微粒物质和臭氧。

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The hope is that patients come to see the psychological cost of a harmful relationship and act to change it.

希望病人会逐渐看到一个有害的人际关系会让他付出心理上的代价，并采取行动来改变它。

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Eliminating that risk altogether is impossible, but if regulators act now while the rules are still malleable, they can make such crises less likely and reduce their harmful effects.

消除所有的风险是不可能的，但是如果监管机构现在行动，同时规则的弹性大，这些危机可以减少发生并且危害较小。

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According to Ferdowsian, the Great Ape Protection Act,or GAPA, "would ban all invasive and harmful research on chimpanzees in American laboratories."

VOA: standard.2010.02.16

The island's peat and blanket bogs support wildlife and act as a natural store of potentially harmful carbon.

BBC: Peat land on Lewis

She pointed out that the Children's Internet Protection Act already requires libraries to block net content that is harmful to children.

BBC: Many schools have already banned social network sites

Some believe that retrofitting ships with equipment like "scrubbers" that remove harmful emissions from vessels could help the industry to clean up its act.

CNN: Shipping looks to clean up its act