如果你网上goole一下，有很多研究数据，戴口罩会大大减低传播

来源: 进宝妈妈于 2020-11-11 23:03:50 [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.