Saburou is my best friend.

Noburu is my best friend.

My subordinate is very capable.

On a cold day, Buu's hot water is the best.

He is interested in ancient weapons.

He is a second-year high school student.

I used an optical microscope for an experiment at school.

Infrared astronomy plays a very important role in the study of the universe.

He is an expert in astrophysics.

It is important for each person to fulfill their role.