中国古代为什么没能发明自行车?
所有跟帖:
• 中国古代只发明火箭,也没好意思发明宇宙飞船,嫦娥还得自己飞上月球。 -老生常谈12- ♂ (0 bytes) () 12/18/2018 postreply 19:50:08
• 中国古代只发明火箭,也没好意思发明宇宙飞船,嫦娥还得自己飞上月球。 -老生常谈12- ♂ (0 bytes) () 12/18/2018 postreply 19:50:08
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