6 R0 n- N0 i% z- W4 O8 I. W, P% TScientists 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. % f; h$ l; w# _+ Q- Mhttps://www.theguardian.com/soci ... -system-experts-say/ C2 ?* X Q# a! _/ l
Lockdown最受害的是儿童。