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.

Once, we used to play in the park every day.

He tends to hold onto past failures.

Once upon a time, there was a man called the old man of Taketori.

Long, long ago, there was a big castle in this place.