1818年法国人卡尔·杜雷士取得了自行车的发明专利权。当时他不会想到,由他发明的这种以人力驱动的交通工具,经过15多年的不断完善之后,在中国得到了登峰造极的发展。在我国,自行车是人们普遍使用的交通工具。据统计,截止到1986年,我国自行车的总辆数已达2.5亿辆。特别是在城0市,自行车的拥有量更为可观。例如,北京 In 1818 the French Carle Du Leis won the invention patent of bicycle. At that time, he would not have imagined that the manpower-driven transport invented by him had achieved peak success in China after more than 15 years of continuous improvement. In our country, bicycles are the common means of transport. According to statistics, as of 1986, the total number of bicycles in China has reached 250 million. Especially in City 0, the ownership of bicycles is even more impressive. For example, Beijing