众所周知，污染是一个长期问题，没有任何一个政府能够单独应对这个挑战。
It is known that pollution is a long-term problem, and no single government can meet the challenge alone.
专家说需要对每种污染物进行测试，以查明对人类的长期影响。
Experts say testing needs to be done on each contaminant to determine the long-term effects on humans.
长期接触这些污染物可能会引起慢性疾病。
Prolonged exposure to these pollutants may result in chronic disease.
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