He stays well because he leads a healthy lifestyle.

He successfully finished the project.

Have sweet dreams!

Ryoko is my best friend.

This book is very good.

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.

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