请问作者在文中这么说病毒来源有确凿证据还是凭空臆造？！

来源: 北疆大妈于 2021-12-04 05:35:00 [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.