傳染途徑是什麽？空氣，接觸，唾液，體液？不知道傳染途徑，怎麽預防？

來源: 笑薇. 於 2020-01-20 20:00:03 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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傳染途徑是什麽？ 空氣，接觸，唾液，體液？ 不知道傳染途徑，怎麽預防？