An astronomical unit represents the average distance from the Earth to the Sun.

This product has a very small assembly unit.

I have been to France once.

He finished all his work all at once.

The Zero was the main fighter of the Japanese Navy.

Reiji is my best friend.

A zero vector is a vector where all elements are zero.

This game is considered a zero-sum game.

This book, which is missing a large proportion of its scrolls, is a 'zero book'.

The absolutive case is a grammatical case that can represent both the subject and the object.