I heard the sound of cicadas in the park.

He is world-famous as a comparative linguist.

This painting is a masterpiece from the Renaissance era.

He got a four of a kind in poker.

He bought a new leather jacket.

The United Nations Environment Programme is providing solutions to global environmental problems.

He prostrated before the king to show respect.

Mr. Danno is a mathematics teacher.

He is suffering from acquired immune deficiency syndrome (AIDS).

This mutetrahedron plays a very important role in the world of mathematics.