论文部分内容阅读
两个轮子,一个坐垫,一副车架……出发喽!打开这份大折页,一起来回顾过去200多年来所有关于自行车的故事吧。
Two wheels, a cushion, a frame ... ... Departure myself! Open this big page to review all the stories about bicycles for more than 200 years.