I mailed a letter at the post office.

I am waiting for the visitor to come.

We always prioritize customer satisfaction.

There are many callers today, aren't there?

This refrigeration system is very efficient.

Please refrigerate the beer.

His name quickly faded into oblivion.

My new tripod is very stable.

We were forced to retreat in the face of the enemy's attack.

Because the enemy's attack became intense, we had no choice but to retreat.