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

We went to see a movie in the town center.

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

He plays a central role in this project.

He is majoring in economics.

He is a renowned economist who has written many important papers.

He is facing economic problems.

The government has announced a new budget plan.

He acted according to my instructions one by one.

The crescent moon is floating in the sky, it's very beautiful.