This quiet place is my favorite reading spot.

His knowledge is limited only to science.

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.