本帖最后由 zhousht 于 2021-8-6 17:26 编辑 9 g1 J; t1 e( b) X, y' _5 k# G
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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.$ c3 Z( Q5 m M, W+ }# z( n2 O5 |6 Y L https://www.theguardian.com/soci ... -system-experts-say . a, _& y& f0 V$ j8 [5 I. pLockdown最受害的是儿童。