tread-mill

柯林斯词典

1. N-COUNT 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. 单调的工作
He exhausted himself on an endless treadmill to pay for rent and food. 为了支付房租和食物，他精力全都耗在了一份没完没了的单调工作上。
2. N-COUNT 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. 踏车