He is an expert in planetary science.

Humanities is an academic field that studies human culture and society.

He is an excellent doctor.

He is a famous author, and his works are loved by many readers.

He likes to take a walk in the park at dusk.

My spouse is a doctor.

That theory is unscientific and has no evidence at all.

He is an expert in computer science.

The Ministry of Education is responsible for Japan's educational policy.

My father is an expert in otolaryngology.