@tylerblack32 @zhang_yueting @loscharlos @DailyJLee Is this "hybrid immunity"? Trying to understand the decline to almost zero in January and then the recovery to 40%.
@tylerblack32@zhang\u yueting@loscharlos@DailyJLee这是“混合免疫”吗？试图理解1月份下降到几乎为零，然后恢复到40%。