给你一个文章看看,相信科学,不相信鬼神

来源: 2020-12-04 15:22:49 [旧帖] [给我悄悄话] 本文已被阅读:

https://www.kqed.org/mindshift/56842/what-the-research-says-about-school-reopening-and-covid-19-transmission