漠渔
春芽
共回答了15个问题采纳率:93.3% 举报
The history of human use of the wheel about 5000 years,and in 1839,Macmillan invented a mechanical bicycle.In 1861,a Frenchman named Brunel,the smaller front wheel,making cycling safer and the ongoing attempts to significantly.In 1885,the British Starley invented the bicycle chain drive.Created a large popular bike era.
1年前
9