本帖最后由 zhousht 于 2021-8-6 17:26 编辑 k+ T# i+ ?- O7 v# ?& D5 \- `8 V0 k" w5 H
Scientists 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. r0 j6 X* F9 F# f4 P; m+ f& W; Hhttps://www.theguardian.com/soci ... -system-experts-say 5 u. J3 G1 b; j! D9 rLockdown最受害的是儿童。