他告诉群众当在一个拥有干净空气的环境中服用的时候，这种药服才会能起到最好的效果。
He told the crowd that the drug would best take effect when consumed regularly in an environment with clean air.
拥有3亿人口的美国，相比较40年前2亿人口时，空气和水都更清洁干净了。
With a population of 300 million, the United States has cleaner air and water now than 40 years ago, when the population was 200 million.
拥有3亿人口的美国，相比较40年前2亿人口时，空气和水都更清洁干净了。
With a population of 300 million, the United States has cleaner air and water now than 40 years ago, when the population was 200 million.
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