Strong interaction is one of the four fundamental forces in particle physics.

Electromagnetic interaction is one of the fundamental forces used to explain the force between substances.

Gravitational interaction creates attraction between objects.

He is the founder of this company.

I think his skills are appropriate for that job.

The postage for this product is free.

The police are closely monitoring the activities of the motorcycle gang.

His success is small, relatively speaking.

He used his creative originality to solve the problem.

We are developing a new transportation system.