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.

His thinking ability is very high.

His fighting strength is very high.

I learned how to calculate rational expressions in math class.

A kana ligature is one of the notation methods in Japanese.