He finished the job in slightly more than an hour.

Tsuyoshi is my best friend.

He is a very strong person.

There are various types of plants in my garden.

His strength comes from his mental power.

The roots of this plant extend deep.

His success is due to his perseverance.

Growth hormone plays an important role in promoting the growth of the human body.

He underwent a xenotransplantation surgery.

He is scheduled to undergo liver transplantation surgery.