In order to maintain the security of encrypted communication, we perform key exchanges regularly.

We exchanged our old books for new ones through barter.

He works at the switchboard.

We wrote essays for peer grading.

We write in the exchange diary every day.

I exchanged my old smartphone for a new one.

Let's exchange keys tomorrow.

My personal thought is that everyone should be treated equally.

He values his private life.

He holds a personal grudge against me.