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.
请相信，只要我们努力，我们就能拥有一个更好更干净的环境。
We are sure that we can have a better environment in the future if we make enough efforts.
请相信，只要我们努力，我们就能拥有一个更好更干净的环境。
We are sure that we can have a better environment in the future if we make enough efforts.
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