Try search for images, and you'll see

来源: 冲浪潜水员 于 2012-12-01 11:44:42 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (217 bytes)
本帖于 2012-12-02 08:49:55 时间, 由版主 林贝卡 编辑
回答: Thanks for sharing your thoughts... 由 同学小薇 于 2012-12-01 07:45:31

that an echo tube is some long piece of tube, or pipe, which will echo back what you say. In other words, it always agrees with you!

I haven't played with one yet, but it looks like a lot of fun :)

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• learn something new everyday. Thank you! -同学小薇- ♀ 给 同学小薇 发送悄悄话 同学小薇 的博客首页 (0 bytes) () 12/02/2012 postreply 05:15:26

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