日夜 (rì yè): day and night

In order to finish the project on time, he worked day and night, not even having time to eat.

After the flood, rescue workers fought day and night on the front line of flood control to protect the safety of the people.

This convenience store is open day and night, providing great convenience for nearby residents.

While her mother was hospitalized, she stayed by the sickbed day and night, almost never getting a good rest.

As the exam approached, he reviewed his lessons day and night, hoping to get into his ideal university.