http://indianapublicmedia.org/amomentofscience/why-your-voice-gets-lower-when-you-have-a-cold/
• 恩, 現在理論有了, 就剩下實踐啦 :) -同學小薇- ♀ (0 bytes) () 07/29/2011 postreply 19:46:08