round/around the clock idiom
C1 昼夜地,夜以继日,日夜不停地
all day and all night
Doctors and nurses worked round the clock to help those injured in the train crash. 医生和护士们夜以继日地工作,救护那些火车相撞事故的受伤者。
She needed round-the-clock nursing. 她需要24小时看护。
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