昼夜

这项工程必须在规定的昼夜内顺利完成。

zhè xiàng gōng chéng bì xū zài guī dìng de zhòu yè nèi shùn lì wán chéng.

This project must be completed smoothly within the prescribed time limit by day and night.

医疗科研团队昼夜奋战，终于成功研发出了新型疫苗。

yī liáo kē yán tuán duì zhòu yè fèn zhàn, zhōng yú chéng gōng yán fā chū le xīn xíng yì miáo.

The medical research team fought day and night and finally successfully developed a new type of vaccine.