This area is rich in green tuff.

This area is rich in green tuff, forming a distinctive landscape.

Understanding the rules of 'Ha-gyou tenko' is difficult.

As soon as he arrived, he said 'I just got here.'

The Transmission Control Protocol is an important element for ensuring the reliability of data communication.

He lost his virginity yesterday.

He lost his virginity last night.

He roughly carved the wood into shape.

Mr. Zhai is my best friend.

He checked whether he remembered or not.