By the way, what is "echo tube" mean? Is it an idiom? Tried but can't find in Google
Thanks for sharing your thoughts...
所有跟帖:
• Try search for images, and you'll see -冲浪潜水员- ♂ (217 bytes) () 12/01/2012 postreply 11:44:42
• learn something new everyday. Thank you! -同学小薇- ♀ (0 bytes) () 12/02/2012 postreply 05:15:26