tread mill是什么意思 tread mill怎么读
tread mill的英文翻译是什么意思,词典释义与在线翻译
名词 treadmill:- an exercise device consisting of an endless belt on which a person can walk or jog without changing place
- a mill that is powered by men or animals walking on a circular belt or climbing steps
- a job involving drudgery and confinement
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