本帖最后由 zhousht 于 2021-8-6 17:26 编辑 ; w- |) d' f* |" v
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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.8 i7 `4 \+ ]5 A. ~4 G& E% E: X https://www.theguardian.com/soci ... -system-experts-say 6 k1 M$ d' ?8 p* m& HLockdown最受害的是儿童。