This area is rich in schist.

He is spending time editing the article.

His life was like hell.

He decided to return to his home country.

He said he experienced purgatory to cleanse his sins.

He spent 10 years in prison.

He is planning to travel to three countries.

This information is absolutely secret, so please don't tell anyone.

This project is proceeding in total secrecy.

It is important for us to deepen our friendly relations with neighboring countries.