He is majoring in philosophy.

The procedures to obtain a new visa are complicated.

He is a famous philosopher.

My father works at an ironworks.

His way of thinking is very philosophical.

He is a famous philosopher, influencing many people.

Hiroshima and Nagasaki are the only cities that have suffered from atomic bomb damage.

He disclosed his secret.

We must not forget the horror of nuclear and hydrogen bombs.

He was involved in the development of the hydrogen bomb.