He is an expert in theoretical physics.

We report the progress of the project based on the principle of reporting, contacting, and consulting.

In this forest, various organisms live by building a relationship of mutualism.

In ancient Japan, the Housou clan played an important role.

Ainoya-san is my best friend.

The phrase 'the good and bad deed cancel out' perfectly describes his past actions.

We should always remember the power of Kannon in difficult times.

He learned how to operate the anti-tank gun.

The National Research and Development Agency plays a crucial role in advancing science and technology.

General relativity is a theory of physics proposed by Einstein.