a device formerly used for driving machinery, consisting of a large wheel with steps fitted into its inner surface. It was turned by the weight of people or animals treading the steps.
踏车(过去由人或牲口踩动踏板以驱动机器)。
a similar device used today for exercise
健身踏步车。
〈喻〉 令人厌倦的工作;单调的工作;令人不快的情况
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the soulless treadmill of urban existence .枯燥无味的城市生活。