He has deep knowledge about science.

We are proceeding with the land exchange process.

He exchanged land with his neighbor.

This area was once called a barbarian land.

He participated in the war as a draftee when he was young.

It is important to regularly oil the car's engine.

I regularly oil the chain of my bicycle.

This wall is made of clay.

Her natural beauty is truly captivating.

Her beauty is all natural, and that's part of her charm.