The impression from that sight left a deep mark on his heart.

There is a state-of-the-art electron microscope in my laboratory.

The Yata no Kagami is a sacred mirror that appears in Japanese mythology.

He monitored the enemy's movements using a periscope.

I used an optical microscope for an experiment at school.

When I look into her eyes, it's like I can see her heart. That's because the eyes are the window to the soul.

He was born and raised in South Hamgyong.

He was born and raised in North Hamgyong.

He wrote a message using mirror writing.

The event horizon is a part of a black hole, referring to the region from which even light cannot escape.