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多少年来,人们一直在梦想:当下火车或下汽车时能有一辆随身携带的自行车,骑上它任你自由来往,避免大街小巷去数门牌号码,去找单位办事的奔波之苦。为了实现这一梦想,发明
For years, people have always dreamed of being able to have a carry-on bike in the train or off the car and ride on it for free travel to and from the streets and alleys to count the number of houses and to look for work-related hardship. In order to achieve this dream, invented