Quantum mechanics is a branch of physics.

He bit his both lips trying to hide his nervousness.

Amphibians can live both in water and on land.

Ryosuke is my best friend.

Ryosuke is my best friend.

He is living as a hunter.

He is a person who acts with good sense.

My parents live in Japan.

He is famous as a countertenor singer.

This shirt is made of very good quality material.