為什麼沙地或泥地上踩自行車很費力? - 自行車

By Quintina
at 2012-01-29T00:00
at 2012-01-29T00:00
Table of Contents
如題我知道有很多類似的問題,但是答案都不一樣。請各位大大好心人士幫我回答一下嗎?P.S.愈長愈好,但不要廢話有15點喔!(小弟很窮,沒什麼點)
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自行車
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By Candice
at 2012-02-01T19:59
at 2012-02-01T19:59

By Edwina
at 2012-01-29T19:12
at 2012-01-29T19:12
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