My great-grandfather was a leading painter in Japan when he was young.

Heavy hydrogen is one of the isotopes of hydrogen.

He has fundamental knowledge of mathematics.

Carbon monoxide is a colorless, odorless gas, and it is dangerous to inhale.

I am majoring in histology at university.

This rodenticide is particularly effective against mice.

Hydrocarbon is a basic element of chemical reactions.

He is an expert in enzymology and conducts many researches.

My great-great-grandmother is still healthy and living a long life.

The Riemann sum is a method for approximately calculating the integral of a function.