He measures time accurately using an atomic clock.

The safety of nuclear reactors is very important.

The atomic weight of helium is 4.

Nuclear fission is a powerful phenomenon that generates energy.

This nuclear reactor is designed to be very safe.

2.5D stage is a new form of entertainment where real actors play anime characters.

He participated in the Olympics as a pentathlon athlete.

Carbon dioxide is one of the main causes of global warming.

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