昼夜不息 zhòu yè bù xī

DEFINITIONS

  1. day and night without rest; ceaseless, continuous operation or activity

CHARACTERS

昼 zhòu
HSK 6
daytime, daylight
夜 yè
HSK 5
night, dark; in night; by night
不 bù
HSK 1
no, not; un-; negative prefix
息 xī
HSK 2
rest, put stop to, end, cease