He is majoring in architecture.

He is an expert in human anatomy.

He is a professor of algebra.

He is majoring in law at university.

He is majoring in engineering.

The concept of chemical equivalent is essential for understanding chemical reactions.

He is an expert in chemical analysis.

We are growing vegetables without using chemical fertilizers.

Oxygen, which is one of the chemical elements, is necessary for us to breathe.

He decided to suspend his studies for health reasons.