“修订《环境空气质量标准》的初心就是保护人的健康。”李天威说，国内外大量环境毒理学、流行病学的研究结果都表明，PM2.5仍然是对人体健康影响最大的污染物。
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The first legs of the Copa del Rey semi finals really delivered. Real Sociedad secured a huge 1-0 win over Athletic Bilbao in the Basque Derby, and then Atlético Madrid shocked the world by beating Barcelona 4-0. In doing so, they've put one foot in the final. The job isn't done yet, because if there is one team that can come back from 4-0 down, it's Barcelona.，这一点在体育直播中也有详细论述
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