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.

Life is a series of ups and downs.

Life is a series of vicissitudes.

This mineral is called anhydrite.

Maintaining oral hygiene is very important for overall health.

He is working at the pithead.

We steered the ship towards the harbor entrance.

He practices every day to improve his sailing skills.