大城市地区慢性危害是常见的。

Chronic injury in metropolitan region is common.

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因滥用农药可能引起的慢性危害更加受到公众的关注。

Possible chronic risks from the use of pesticides are of much greater public interest.

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控制皮肤污染是预防低浓度TNT '慢性危害的重要措施之一。

To control the skin concentration is one of important measures to prevent the chronic hazards of TNT in lower concentration.

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