I have been to France once.

He finished all his work all at once.

A day has 24 hours.

"Once in a lifetime" means to cherish the encounter that happens only once in one's lifetime.

He missed a once-in-a-lifetime opportunity.

He ate one apple.

It is important for each person to fulfill their role.

Let's cherish every encounter with the spirit of 'once in a lifetime'.

He acted according to my instructions one by one.

He said, 'Each person has one life, like a pike or a shrimp,' and decided to live his life with care.