He is an expert in ring theory and has written many papers in the field.

The citric acid cycle plays a crucial role in the energy production of cells.

They built an abatis to prevent the enemy's invasion.

The cere of this bird is very brightly colored.

In our medical class, we learned about the function of the pyramidal tract.

There are many calamites growing in this pond.

Only the sound of rowing a boat echoed on the lake.

The sound of rowing a boat on the lake is very calming.

I think he is a true person on the road.

Lomé is the capital of Togo.