@MichaelSFuhrer @antizeroalt @Backtotravel22 20% is a best estimate supported by multiple studies, it's not really optimistic. Of course, getting 100% of people using masks is "optimistic".
I think the 7% is in line with what was claimed in the article. Maybe a bit different with different assumptions from yours.
@MichaelSFuhrer@antizeroalt@Backtotravel22 20%是得到多项研究支持的最佳估计，这并不乐观。当然，让100%的人使用口罩是“乐观的”。
我认为7%与文章中所声称的相符。可能与你的假设有点不同。