We write in the exchange diary every day.

In mathematics, the commutative law applies to addition and multiplication.

Let's exchange keys tomorrow.

In physics, it is important to calculate the center of mass of an object.

We chose Kyoto as the center of our trip.

He should stop his selfish behavior.

There are many historical buildings in the central part of this city.

We went to see a movie in the town center.

He has a very passive personality.

He decided to undergo sex reassignment surgery.