昼夜 zhòuyè day and night
day and night; period of 24 hours; continuously, without stop
How to remember 昼夜: 昼 daytime + 夜 night = day and night.
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How it is used
- Day and night / around the clock - 昼夜不停 (zhòuyè bù tíng) nonstop day and night, 昼夜温差 (zhòuyè wēnchā) the day-night temperature difference.
- Formal, written; 昼 (daytime) + 夜 (night). Often stresses continuous, ceaseless activity over a full 24 hours.