this is a shared bike, today let’s see how much we can learn from a bicycle.
    this is a handlebar, front brake, rear brake, this is a bell, basket, mudguard, wheels, pedals, chains, and this is called kickstand, lock, seat, we can hand-switch to adjust the height of the seat .
    这是一辆共享单车，今天我们来看看我们能从一辆单车上学到多少。
    这是一个车把，前刹车，后刹车，这是一个铃铛，篮子，挡泥板，轮子，踏板，链条，这叫做支架，锁，座椅，我们可以手动调节车座的高度。