5 u1 O- g: Q. A- O" X: }9 m! jScientists 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 ^1 y% L0 \( X+ A% |1 j. k' S7 Vhttps://www.theguardian.com/soci ... -system-experts-say& j$ h& A+ m5 {( H/ a2 |2 M: s1 X2 V
Lockdown最受害的是儿童。