恩,我覺得是,再就是我狗到的這個原因:

來源: 2011-07-29 19:25:25 [博客] [舊帖] [給我悄悄話] 本文已被閱讀:

http://indianapublicmedia.org/amomentofscience/why-your-voice-gets-lower-when-you-have-a-cold/