Please leave a message on the message board.

Could you tell me your telephone number?

In his study of international law, he particularly focuses on jus gentium.

What is your favorite television program?

He carried out the real thing without any rehearsal.

We have installed a new standing signboard.

She was a secret kunoichi (female ninja).

"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 was focused on his work all day long.