去年的疫苗也是吧？疫苗向来不能100%保证不得流感。也许40%的效率就不错了？

来源: 闲情于 2019-02-01 16:18:57 [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.