本帖最后由 zhousht 于 2021-8-6 17:26 编辑 0 b) Q: G$ q3 f/ y- w
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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. 1 p: r9 w8 E4 r; i; d( I( Fhttps://www.theguardian.com/soci ... -system-experts-say $ O1 _: K4 e/ K$ b, r+ |9 BLockdown最受害的是儿童。