hamster wheel
uk
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/ˈhæm.stə ˌwiːl/us
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/ˈhæm.stɚ ˌwiːl/ noun an activity that involves someone being busy all the time but never achieving anything important or reaching the end of a task: There's always something that needs to be done to the house. It's like a hamster wheel. 房子总有要修修补补的地方，就像仓鼠轮一样，没完没了。