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自行车只有两个轮子,为什么骑起来可以保持平衡呢?甚至高手在骑车的时候可以双手离开车把,任由车子向前走而不担心摔倒?
Bicycles only two wheels, why ride up to balance? Even the master in the bike when you can leave the handlebar, let the car go forward without fear of falling?