He is an expert in astrophysics.

He is an expert in molecular biology.

I am majoring in developmental biology at university.

Biotechnology is a science that understands the mechanisms of life and utilizes them.

He is an expert in nuclear physics.

My brother is a famous biologist.

He is interested in paleozoology.

Mr. Sekigami bought a necklace for his wife’s birthday.

Dear Sirs, I am under your care.

A diaeresis is used to change the pronunciation of vowels.