& U9 J5 i9 e& C; l" Q/ F/ HScientists 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.2 F# i9 c1 d; w! i https://www.theguardian.com/soci ... -system-experts-say2 m+ a/ `8 `5 N8 P5 U
Lockdown最受害的是儿童。