I learned about the reaction of nitrous acid in chemistry class.

This bird is classified in the suborder of birds.

It is very interesting to learn about the geography of a subcontinent.

In the past, 'Agun' was used as an abbreviation for 'Alameda County'.

Momoa is my best friend.

In the past, 'Aichi' was used as an abbreviation for 'Arameda-shi'.

Asia is the largest continent on Earth.

My friend came from Argentina.

My friend came from Argentina.

My friend is living in Argentina as a resident.