夜以继日

yèyǐjìrì

day and night; round the clock

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day and night; night and day

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night and day

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yè yǐ jì rì

n. day and night, all day; all the time, constantly, continually

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ye4 yi3 ji4 ri4

night and day (idiom); continuous strenuous effort

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夜以继日

yè yǐ jì rì

round the clock; day and night; continue the day by night; day in, day out; lengthen the day by taking in the night:

夜以继日地工作 go on working night and day -- round the clock; work day and night (continuously);

工程正在夜以继日地进行。 Work on the project is going on day and night.

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夜以繼日|夜以继日 [yè yǐ jì rì] ► night and day (idiom); continuous strenuous effort