You can refer to a task or a job as a treadmill when you have to keep doing it although it is unpleasant and exhausting.
例句
Mr Stocks can expect a gruelling week on the publicity treadmill.斯托克斯先生可以預(yù)見下一周會被枯燥繁重的宣傳工作搞得焦頭爛額。
N-COUNT
踏車;跑步機(jī)
A treadmill is a piece of equipment, for example an exercise machine, consisting of a wheel with steps around its edge or a continuous moving belt. The weight of a person or animal walking on it causes the wheel or belt to turn.