He is a famous historian and has written many history books.

He witnessed a fatal traffic accident.

He was run over and killed in an unexpected accident.

His new painting is being described as a Picasso-style work.

The flow of the river is very beautiful.

The flow of the river is very quiet and comfortable.

This is a historic building.

He is majoring in history at university.

He was elected as the president of the student council.

What does that mean?