[ S ] any type of repeated work that is boring and makes you feel tired and seems to have no positive effect and no end繁重无聊的重复性工作
[ C ] an exercise machine that consists of a moving strip or two step-like parts on which you walk without moving forward(锻炼用的)踏步机,跑步机
[ C ] a wide wheel turned by the weight of people climbing on steps around its edge, used in the past to provide power for machines or, more usually, as a punishment for prisoners(过去通常用以惩罚犯人的)踏车
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