疫苗的目的不单是降低感染率，最主要是重症率和死亡率。美国人说的

来源: coolwin 于 2021-03-23 06:45:37 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.