原來自行車也有改進空間。中國老頭兒發明快速自行車。想擁有這樣一部自行車，鍛煉身體。

來源: 禦用文人於 2016-10-22 12:44:39 [舊帖] [給我悄悄話] 本文已被閱讀：次

https://www.youtube.com/watch?v=QM7_k7hCm_k

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