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.

These two software have complete interchangeability.

He is spending a lot of time on experimental research.

He stated his opinion outspokenly as '咢'.

He is majoring in psychology.

Gaku is my best friend.

He learned the old character form of 學 to study ancient documents.