He utilized his experience from the past to make the new project a success.

I forgot my student ID card.

He is an enrolled student at the University of Tokyo.

He participated in the student movement of the 1960s.

I am a member of the student body.

He is a famous athlete.

He is a famous baseball player.

The Olympic village is a facility where athletes stay.

He is active as a professional athlete.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.