夜以繼日

yèyǐjìrì

day and night; round the clock

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