The inner shell of this shellfish is very hard.

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

The inner enclosure of this castle is very sturdy.

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.

In Japanese grammar, the adnominal case is the form where nouns or pronouns modify other nouns.

In this right triangle, since one angle is 30 degrees, its complementary angle is 60 degrees.

My grandfather used to raise domestic fowls.

He wrote a letter and sent it to his friend.