夜以繼日[yè yǐ jì rì]
[詞典] round the clock; day and night; continue the day by night; day in, day out; night and day
[例句]
People?who?do?very?important?jobs?sometimes?have?to?work?around?the?clock.?
有重要工作的人，有時必須夜以繼日地工作。