He is using morphine to alleviate pain.

He decided to train in seclusion on a mountain for self-improvement.

He is training in seclusion on a mountain to become stronger.

String theory is a branch of physics that is a theory for understanding the basic structure of the universe.

He wrote a new paper on string theory.

Eishin likes games.

He turned thirty years old.

This picture is fixed to the frame.

This plant needs oxygen to perform photosynthesis.

In this story, Zuan is the protagonist, and his adventure continues.