昼夜 / 晝夜 (zhòu yè) – day and night, period of 24 hours

Individual characters

我每天都工作昼夜。

wǒ měitiān dū gōngzuò zhòuyè 。

I work day and night every day.

这项任务需要昼夜不停地努力。

zhèxiàng rènwù xūyào zhòuyè bùtíngdì nǔlì 。

This task requires continuous effort day and night.

他们的研究项目持续了昼夜，终于取得了突破。

tāmen de yánjiū xiàngmù chíxù le zhòuyè ， zhōngyú qǔde le tūpò 。

Their research project continued day and night, and finally made a breakthrough.

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