This markstone indicates the boundaries of the ancient times.

Mr. Iwaishi is my best friend.

Mr. Iwaishi is my best friend.

His hobby is collecting loose stones.

The children were playing hopscotch in the park.

In this chemical reaction, a specific isotope is produced.

She wrote her name in cursive script.

This sentence is written in bold typeface.

This pathogen is very dangerous to humans.

There is a possibility that unknown lifeforms exist on this planet.