His opinion is always rational.

I was born and raised in Kowloon.

That plan is based on rational thinking.

He was elected as the Prime Minister of Japan.

This system is too irrational to understand.

I am surprised at the irrationality of this system.

This project requires a lot of work.

He believes that he is a psychic.

He was working all day on the farm, using his labor.

He achieved a splendid victory in the Go tournament.