He is an expert in toxicology.

He is an expert in orthoepy, teaching pronunciation.

He is an expert in planetary science.

My major is chemical engineering.

She decided to speak publicly about her gender identity.

Former Imperial Universities are some of the most traditional universities in Japan.

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

He is a world-renowned biologist.

Astrobiology is a very interesting field of study.

He is an expert in biophysics.