When you are learning to ride a bicycle, you often fall off.

初学自行车时，常会从车上掉下来。

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Cyclists jump on and off pavements and ride at speed along the pavements.

骑自行车的人在人行道上跳上跳下，并且沿着人行道高速行驶。

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They often ride off on minor issues in an important meeting.

他们在重要会议上往往扯到一些枝节问题上而回避要害问题。

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