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夜以继日
夜以繼日
yèyǐjìrì
1. night and day (idiom); continuous strenuous effort

Character Breakdown

夜
yè
night, dark; under cover of night
HSK 5 8 丶
以
yǐ
according to; so as to; because of; then
HSK 2 4 丶
继
jì
to continue, to carry on; to succeed, to inherit
HSK 4 10 丶
日
rì
sun; day; daytime
HSK 2 4 丶

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Chinese