The elevator has gone down.

This jacket is made of down and is very warm.

Please use the stairs because the elevator is down.

The character '云' is a Chinese character.

I looked up at the sky where the clouds of war were looming.

There are a lot of delphacids in this rice field.

Delphacids are pests of rice, causing significant damage to crops.

The top of the mountain was covered in cloud and mist.

The Horsehead Nebula is one of the celestial bodies that symbolize the beauty of the universe.

Undecene is produced in this chemical reaction.