He is in the third year of junior high school, or in other words, he is in the 9th grade in school years.

He has a deep interest in numismatics.

I found a spider starfish on the sea floor.

He was reading a true account of the incident.

You can find a brittle star on the sea floor.

His figure disappeared as if it had vanished into thin air like a cloud.

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

I found a rare snake tail (brittle star) in this sea.

His airplane vanished behind the clouds.

He disappeared as if he had vanished into thin air.