本帖最后由 zhousht 于 2021-8-6 17:26 编辑 ( V' a1 N* j6 k6 ]: K
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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.% Y2 ?; B3 |% ~5 Y- c https://www.theguardian.com/soci ... -system-experts-say + f" M# b5 z6 a8 F9 i0 fLockdown最受害的是儿童。