The study looked at more than 300,000 people in Australia, Europe and North America.
研究人员调查了来自澳大利亚、欧洲和北美洲的30万余名雇员。
A new study has both good news and bad news about pollution in North America.
最新一项针对北美地区污染问题的研究表明，那里的情况让人喜忧参半。
A new study has both good news and bad news about pollution in North America.
最新一项针对北美地区污染问题的研究表明，那里的情况让人喜忧参半。
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