I have four dependents in my family.

I'm scared of growing old.

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.

Shingo is my best friend.

She is conducting research on the world's oldest profession.

A positive-definite matrix is an important concept in linear algebra.