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

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

Please research the interaction between these two drugs.

Fundamental knowledge of mathematics is necessary for daily life.

The study of elementary particles is an important field in physics.

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

Gravitational interaction creates attraction between objects.

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

His only weakness is sweets.

He is weak, so he tends to get sick easily.