He naturally demonstrated leadership.

This area is affected by radioactive fallout from past nuclear tests.

This area is seriously contaminated with radioactive isotopes.

Rare earth elements are essential materials for the manufacture of electronic devices.

An isotope refers to elements with the same atomic number but different numbers of neutrons.

Transition elements play an important role in chemical reactions.

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

I am very interested in social science.

A cooling device utilizing the principle of radiative cooling has been developed.

He is receiving treatment for brain radiation.