bicycle       
noun [ C ] uk/ˈbaɪ.sɪ.kəl/ us/ˈbaɪ.sə.kəl/ (informal bike)
A2 自行车,单车,脚踏车
a two-wheeled vehicle that you sit on and move by turning the two pedals (= flat parts you press with your feet)
  I go to work by bicycle. 我骑车去上班。 
 He got on his bicycle and rode off. 他骑上车走了。 
 You should never ride your bicycle without lights at night. 你千万不要在夜间不开车灯骑自行车。 
 Synonym: cycle 
 - More examples
 - I ride my bicycle to work.
 - The bicycle was resting against the wall.
 - a bicycle shed
 - I got my bag caught in the wheel of my bicycle.
 - She had no brakes on her bicycle.