本帖最后由 zhousht 于 2021-8-6 17:26 编辑 5 j4 y: g& H% O, O. |8 N. T, }
6 {0 x4 q _: i- s$ NScientists are concerned that measures to combat Covid-19 have weakened the immune systems of young children who have not been able to build up resistance to common bugs, leaving them vulnerable when mask-wearing and social distancing eventually end.9 n3 T2 C. U# O/ W2 Q https://www.theguardian.com/soci ... -system-experts-say M5 M" f1 |' N) g1 MLockdown最受害的是儿童。