The safety of nuclear reactors is very important.

He received an official notice.

We achieved our goal and achieved success.

This nuclear reactor has reached a state of criticality.

I'm worried about his health condition.

This furnace operates very efficiently.

In this factory, they melt iron using an electric arc furnace.

Understanding the structure of atoms is a fundamental part of physics.

He ended up in a vegetative state after the accident.

This program is designed to avoid a race condition.