平常同学们都怎么去上学呢?步行,骑车,或者坐汽车?相信多数还是骑车。作为一种轻型无污染的代步工具,自行车无疑是绿色低碳出行的最好方式。不过,你知道自行车是怎么造出来的,又经历了怎样的变迁呢?就让我们到河北省霸州市的中国自行车博物馆看看吧,那里可是——轮子上的王国 How do ordinary people go to school? Walking, cycling, or taking a bus? I believe most of them ride their bicycles. As a light pollution-free means of transport, bicycles are undoubtedly the best way for green low-carbon travel. However, you know how the bicycle was made and what changes have been made? Let’s take a look at the China Bicycle Museum in Bazhou, Hebei Province, where the wheel kingdom