為何腳踏車往後踩不會往後退? - 運動

By Daniel
at 2009-06-14T00:00
at 2009-06-14T00:00
Table of Contents
我看過其他已解答的文了~可是還是看不懂~如標題~有哪位天才大大能詳細的解說?~...Showmore
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運動
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By Emma
at 2009-06-14T02:31
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at 2009-06-17T01:14
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at 2009-06-17T14:29
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at 2009-06-17T04:01
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at 2009-06-16T01:49
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