Fundamental interaction is one of the most important forces in physics.

Please research the interaction between these two drugs.

This is the most beautiful flower.

He is an expert in physics.

Weak interaction is one of the four fundamental forces between elementary particles.

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.

It is important to learn the basic grammar of Japanese.

He ate one apple.