戴口罩是百年來醫生的實踐得來的經驗。戴口罩不能解決全部問題，但可以基本有用。

來源: gweipwu 於 2020-10-31 08:01:27 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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