@taipan168 @nerodenc @OXHarryH1 @tax_oz @michaelmina_lab @mbrushstocks I'm not saying don't do it. I'm saying that clean air is merit enough, and it's easy to measure directly. You don't need an indirect statistical study to understand that any more than you do to understand whether a modification to a race car increases speed. Just measure it.
@taipan168 @nerodenc @OXHarryH1 @tax_oz @michaelmina_lab @mbrushstocks 我不是说不要这样做。我是说干净的空气就足够了，而且很容易直接测量。您无需进行间接统计研究即可了解这一点，就像您了解对赛车的修改是否会提高速度一样。只是测量它。