treadmill
n
1 mill-wheel turned by the weight of people or animals treading on steps round its inside edge (formerly worked by prisoners as a punishment) (人力或畜力的)踏車(舊時用以懲治囚犯).
2 (fig 比喻) tiring or monotonous routine work; drudgery 累人的或單調的例行工作; 繁重乏味的工作
I can't get off the office treadmill. 我無法擺脫單調的坐班工作.