You should always be prepared for the time of need.

I woke up at the witching hour.

Following the customs of the time, they celebrated the festival.

During rush hour, the trains are very crowded.

He injured his arm in a workplace accident.

His robbery ended in an attempt.

Natural numbers start from 0 and continue as 1, 2, 3, etc.

Complex numbers are represented by a combination of real numbers and imaginary numbers.

We go sea bathing with the family during the summer vacation.

I feel a lack of sleep.