本帖最后由 zhousht 于 2021-8-6 17:26 编辑 " x$ s3 h0 Y, o! l1 J: ] - R' O& ~6 j5 \( S* X3 W1 n" h4 X! n3 uScientists 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. % p: }' p) [# g# }9 d8 t4 A$ khttps://www.theguardian.com/soci ... -system-experts-say * y4 E1 g/ _3 |) {* d& ^Lockdown最受害的是儿童。