He works at the control tower of the airport.

The five-ringed pagoda is one of the traditional buildings in Japan.

He works in the air traffic control tower.

This advertising tower has become a landmark of the city.

The pyramids of Egypt are a wonder of ancient architecture.

He looked up at the high tower.

It takes twenty minutes to get to my house.

There is a test in two days.

Phthalazine is a compound often used in organic chemistry.

In this experiment, we will observe the crystallization of naphthalene.