He is a professor of algebra.

He is majoring in law at university.

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.

I am interested in dermatology.

He bought a new schoolbag.

Next week, we will go to Kyoto on a field trip.

How much is the amount of money for this product?