Mr. Kagaku is my best friend.

The inner shell of this shellfish is very hard.

The inner enclosure of this castle is very sturdy.

The inner enclosure of this castle was very strong, and it was an important defense line to prevent enemy invasions.

He was observing the inner shell of the clam.

The angle of friction of this material is 30 degrees.

There is no ergative in Japanese.

My apartment is a five-story building.

He was standing on the seashore, staring at the distant horizon.

Japanese is a language with few declensions.