The safety of nuclear reactors is very important.

The use of this machine is simple.

Heavy water is used as a coolant in nuclear reactors.

This refrigeration system is very efficient.

Please refrigerate the beer.

This computer can be used by anyone.

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

This furnace operates very efficiently.

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

He developed a famous chemical agent.