為什麼騎自行車比走路省力呢?為什麼騎自行車比走路省力呢? - 自行車
![Yuri avatar](/img/girl1.jpg)
By Yuri
at 2006-08-02T00:00
at 2006-08-02T00:00
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為什麼騎自行車比走路省力呢?為什麼騎自行車比走路省力呢?為什麼騎自行車比走路省力呢?
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自行車
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![Joe avatar](/img/elephant.jpg)
By Joe
at 2006-08-04T08:45
at 2006-08-04T08:45
![Michael avatar](/img/girl2.jpg)
By Michael
at 2006-08-05T10:13
at 2006-08-05T10:13
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